Explanations

GUYS= colloquial word for "men" or "young men". It often may include women too (but the singular "a guy" is always masculine). Originally AmE is now widely used by young people in Britain too. In America they often use "you guys" as the plural form of "you" ("you are a doctor", "you guys are doctors").

WHAT’S UP?= another AmE expression getting popular among British youngsters. It means "How are you?" or "What’s happening?", "How’s life?", etc. In practice, it just means "hello!".

PROMOTE= give publicity to something.

WORTH + -Ing= if something is worth doing, it is good to do it because it is beneficial, or enjoyable, useful or the right thing to do.

BEAR WITH ME= be patient with me

PICK= choose

SYNONYM= a word that means the same as another word. For instance, "pretty" and "beautiful" are synonyms (though synonyms usually have some little differences in meaning, at least in some situations)

IMPROVE= make better

SCORE= the total points you get in a game or competition.

THE GENIUS OF THE WEBSITE= the great idea of the website

DONATE= to give away for free

UN= United Nations (also UNO= United Nations Organization)

HUNGER= the state of being hungry.

POSITIVES ARE BOUNCED UP WITH NEGATIVES= the positive things are linked to negative things or results that make them unattractive. (not too sure of the correctness of my transcription here, but that’s the meaning anyway)

HANGOVER= the terrible feeling you get the day after you got drunk. If you drink too much alcohol, the next morning you get up with a hangover: a terrible headache and muscular pain all over your body.

WASP= an insect with a poisonous bit that hurts a lot. Their body is very thin but they have a big swollen abdomen with black and yellow stripes (a bit similar to bees but thinner).

IMPROVEMENT= the noun related to the verb "to improve" (see above)

SITE= website

HOWEVER= Nevertheless, but.

RAREST= the most strange (rare= strange, odd). Yes, I know that "the most strange" is not too correct (it should be "the strangest"), but "the most strange" is clear for people with a low level and it is getting more and more acceptable in spoken English (with any short word).

NEGATIVELESS= an adjective he just made up (invented). The ending –LESS means "without", so "a negativeless positive" would mean "a positive thing without negative consequences".

I’M PRETTY SURE= I’m quite sure. In colloquial English (esp. BrE) "pretty" is often used with the same meaning as "quite, rather". Notice that "sure" is presently pronounced like shore".

GONNA= going to (coll.)

STICK WITH SOMETHING= keep it, not change it.

DOESN’T SEEM LIKE A LOT= "Seem" means "look" (referring to appearance"). LIKE here is a preposition of comparison. "Seem like" = "look like". In this sentence, "like" wouldn’t be used in more formal language.

'CAUSE= because (coll.). It may also be spelled: ‘coz, coz, cause.

A COUPLE OF MINUTES= literally "two minutes", but it often means "a little time", indefinite.

OVER A THOUSAND= more than 1000

IT’S GETTING THERE= it’s more and more close to it, it’s almost that.

4,302 subscribers= This video was originally posted on Youtube, and there, people can create a personal channel (where they post lots of videos) and people can subscribe to that channel, see all the new videos posted there, write comments to the videos, rate the videos (give them marks) and more things.

CUT TO A SHOT= a shot is a photograph (coll.), but in movies, a shot is a short scene, a piece of movie. To cut a shot means to film a fragment of the video.

HOLD= to have or carry in your hand or arms

CLOSE= near

COUNT OUT= count something so as to get the total amount of it.

I COULDN’T FINISH IT= here, "could" is not a past tense, but a conditional tense (= I wouldn’t be able to finish it, to eat it all)

VISUAL AID= an image that helps you understand.

I PUT IT TO YOU= I propose to you

THE RATING= the act of giving a mark to the quality of this video (you can rate it from 0 to 5; giving 5 points if you think it’s an excellent video)

FAVOURITING= adding that page to "your favourites" (the way Internet Explorer calls the browser bookmarks)

FEATURE= to feature a video is to show it, to display it.

TO FEED= to give food

WHEN YOU’RE DONE= when you finish

APPARENTLY= supposedly

WHOEVER= anybody who..., it doesn’t matter who...

PRIZE= a gift you get as a reward when you win a competition or do something very well.

THINK SOMETHING THROUGH= think carefully about it

S’= he was probably going to say "SO", but then he changed his mind or simply started a new word before finishing it.

SOUGHT AFTER= Seek-Sought-Sought (= look for, search). Something that is "sought after" is something very popular that many people want.

THINK OF= the verb "to think" can use the preposition "of" or "about" (but never "in")

SCREENSHOT= a photograph of the images that are on the screen. You can easily get a screenshot by pressing the key "print screen" at your computer keyboard. SCREEN= the part of a TV (or at your computer) where you see the images displayed.

OTHERWISE= if that doesn’t happen

BILLION= a billion is a thousand millions in most English speaking countries. In old-fashioned BrE it meant "a million of millions" (and that is still the meaning in the rest of the world)

THAT’S NOT GETTING US ANYWHERE= that doesn’t make any sense, that’s stupid, that’s no use, that’s absurd, that’s no good.

SPREAD THE WORD= tell other people so many people know about it

HTML= the name of the programming language used to produce web pages. This guy pronounces the letter H with an aspiration. As far as I know, that’s not correct.

BANNER= a picture or design (usually a rectangle) which is usually a link on the web page. It is often used for advertising on the web.

WHEREVER= anywhere, it doesn’t matter where

KTHX= an abbreviation for: "Ok, thanks!"

WE MAY BE A BAD PERSON IF I PUT...= This guy sometimes uses the pronoun "we" and sometimes "I" (it’s not strange in a situation like this). If my ear is not terribly mistaken, he started the sentence using "we", but then he changed his mind in the middle of the sentence to use "I" (things like this are not uncommon in oral language).

ADS= short for "advertisement", publicity

ON THIS VIDEO= notice that when we’re talking about moving pictures (TV, films, videos) we use the preposition ON. Also when we talk about the Internet or a website or a web page (on the Internet = on the Net, on my website, on that page).

ZOMG= a variation of OMG, which stands for "Oh My God!". The Z doesn't stand for anything; the word was accidentally invented by users intending to hit the Shift Key instead of Z when typing; and finally, this common mistake got accepted as a more emphatic form of OMG.

ZOMG DEVIL EYE= you can see this phrase flashing on the video for a split of a second. If you manage to freeze (stop) the video at that very moment, you’ll understand why he wrote this. The frozen image shows this guy with a strange evil spark of light on his left eye (the eye on the right part of the video), making him look like a evil (diabolic) person at the very moment when he’s thinking of not doing the right think (a coincidence?).

THE VLOG BROTHERS= a vlog is a "video blog" (if you don’t know what a "blog" is, it’s something similar to a web page but just for writing articles). "The Vlog Brothers" have a very popular channel on Youtube. I don’t know anything else about them but, according to what this guy says, they must do videos about charity projects or something like that.

DON’T BLAME ME= don’t think it is my fault

I’VE SINCE WATCHED= After that moment, I have watched.

CYCLONE= a very strong storm with strong winds that destroy everything. They’re called "cyclones" in Asia and "hurricanes" when they happen in the Americas.

TO MAKE YOU AWARE= to let you know, to make you conscious about something.

TO MAKE YOU AWARE THAT THAT IS...= the first THAT is a conjunction, the second THAT is the subject of the subordinate clause "that is where..."

LIKELY= probable (it ends in –LY, but it’s an adjective, not an adverb; many adjectives end in –ly too, like "friendly")

MANDITORY= a spelling mistake (kind of frequent). The correct spelling is "mandatory" and it means "compulsory". If something is mandatory, you have to do it, weather you like it or not, you have no option.

THAT DOESN’T MAKE SENSE= it isn’t logical, it’s something stupid, not rational.