Combination of the phrase "your ass" and the slogan "verb, its what you do" thus meaning their ass is what you "do." Often used as an insult or inside joke.
an over used townie phrase. townies seem to think its some kind of insult, and the stupid townies, thats all of them, reply with 'your mom' to whatever you say to them ........................................................ idiots
Normal dude: hey, do you know where there bus station is?
Townie: YOUR MOM!
Normal dude: excuse me
Townie: YOUR MOM YOU FUKKIN FAGGOT!