Sarcasm, the ins, the ou- what the **** does Sarcasm mean?

Now I was leaving an innocent duel note, "tits or gtfo", on DN, when a guy messaged me. Through the course of the conversation I came to realise that some people don't know what sarcasm is, and others simply can't use it. So I decided I would teach you all about sarcasm by letting you read this conversation.

Ndasuunye: I have titties
Meheheh: Lies
Ndasuunye: you wanna see a pic of me?
Meheheh: Nothx, Not into fat guys :o
Ndasuunye: ...I'm not fat
Ndasuunye: not by a long shot jib
Meheheh: Oh :o
Meheheh: Honestly though
Ndasuunye: douchebag
Meheheh: I find it hard to beleive all the people that joined my game
Meheheh: Have tits. Ergo, they can gtfo
Ndasuunye: do you rp?
Meheheh: roleplay?
Ndasuunye: YOU DO TOO
Meheheh: Not reaallly.
Ndasuunye: oh.....then why bother asking for girls?
Meheheh: It's called a sarcastic comment :P
Meheheh: I'm saying that when you see "girls only" notes
Meheheh: What they're REALLY saying is tits or gtfo
Ndasuunye: yes I get that
Meheheh: That's why I am sat here talking xD And not accepting duels.
Ndasuunye: i dunno
Ndasuunye: because your a horny little boy
Ndasuunye: who wants to get fondeled by a cute older woman
Meheheh: o____O Sir, my use of language alone should indicate that I am no such thing
Meheheh: In addition, cute older women do not exist on the internet.
Ndasuunye: then you haven't been on a dating site
Meheheh: On the internet, the men are men, the women are men, and the kids are the FBI
Ndasuunye: ....huh?
Meheheh: Don't you get that
Meheheh: ?*
Ndasuunye: i never heard that statement
Meheheh: It's another sarcastic comment
Meheheh: Saying that on the internet, nobody is who they say they are
Meheheh: The men are men, granted. The women are men, looking to pick up other guys
Ndasuunye: whatever you say...GUY
Meheheh: and half the kids are men, chasing after kids to perv on, and half the kids are the FBI, trying to catch the other half of the man-kid-pervert-bearpig-things.
Meheheh: Not very good at sarcasm are you? xD
Ndasuunye: no
Meheheh: You get better with practice dw
Meheheh: You know what sarcasm is right?
Ndasuunye: though that doesn't constitute as sarcasm
Meheheh: It's saying something at one or another end of the extreme to bring a point across
Meheheh: Which you don't really mean or beleive
Ndasuunye: but that's not extreme if you honestly believe that
Meheheh: Which I don't. :P
Ndasuunye: so you don't believe what you said?
Meheheh: That's sarcasm, bbz
Ndasuunye: you seemed like you were pretty serious about that statement
Meheheh: If you pointed at a window and asked me
Meheheh: "Is that a window?"
Meheheh: and I said, "No, it's a bananna."
Ndasuunye: .....whatever
Meheheh: It wouldn't be me seriously telling you it's a bananna
Ndasuunye: i'm a blunt person
Meheheh: I'm not. :D
Ndasuunye: so i told you what i wanted and that's that
Meheheh: What did you want?
Ndasuunye: rp
Meheheh: Oh you want to roleplay that you have tits? o:
Ndasuunye: .....no i wanted to rp that i have a dick -_-
Meheheh: Sarcasm? :D
Ndasuunye: YES
Meheheh: YOU'RE LEARNING!
Ndasuunye: im leaving now
Ndasuunye: bye
Meheheh: Bye
Ndasuunye has logged out

This has been Fish's real-life conversation on sarcasm. I hope you learned something, because I damn well didn't.

Oh my god.

That is so awesome.