What is Afaa?
A word which Arabs use - generally as slang - which has a similar effect to the Americans saying "Oooooooooh!" for example when someone starts a fight.
Or it can mean in your face.
It is like a real version of "pwned".
guy: I'm not going to go out with you sorry
girl: who said I wanted to go out with you anyway loser
random person: AFAAAAA!