Explanations

SURGERY= A medical operation in which some part of your body is cut and messed with.

HOW DID IT GO?= Was everything alright? Any problems?

I FEEL FUNNY= The word FUNNY has two meanings:
1- amusing, something that makes you laugh (sometimes referred to as "funny ha ha").
2- strange, weird (sometimes referred to as "funny strange")
So in case you need disambiguation, you can ask "do you mean funny strange or funny ha ha?)".

KINDA= Kind of. This phrase is used to mean "more or less but not exactly":
- It felt kind of good = It felt good in a strange way. It felt more or less good, somehow.
- He’s kind of big = He’s more or less big, but not exactly.

I'VE TWO FINGERS= When the verb HAVE is an auxiliary (e.g. "I've lived in Paris") it is usually contracted in conversation. When it expresses possession it's not usually contracted, but sometimes it is, like here. This boy uses possessive Have contracted all the time, partly because he finds it so difficult to pronounce and so he simplifies where he can (e.g. "do I've stitches?")

NA-A-A-AH= A very emphatic for of "nah", which is a colloquial way of saying "no".

STITCHES= When you want to join two things together using thread and needle, you use stitches. Every loop of the thread is a stitch. Stitches are also used in surgery to help a wound or cut close and heal. You can see a picture of surgical stitches here (stitches).

MESS UP= To spoil something and maybe cause problems. To make something dirty or untidy.

BUD= Friend (AmE). It is more usual to say BUDDY.
- Hi buddy, how are you today?

GONNA= Going to.