What is Yase?
1.
Synonym for "yes."
The term is from the FYAD forums on the SomethingAwful Forums, cuz they sillie.
Hot chick: Do u like me? (y/n)
Guy: Yase, I do like u.
2.
Exclamation. Slang for yes. See also:
Dude 1: I got hawt Twanee Stone picture from a friend of mine. I'd like to suck his man meat.
Dude 2: YASE!!!1