Another way of saying something rules. Can be used directly in the place of "kick ass" or "kicks ass".
This new Slayer cd rocks ass!
by Soup Bone April 19, 2005
adj. describing something beyond Rock and Roll, something that speaks to the pervasiveness of both our youth, and our beauty.
"Oh my god, There was puke coming out his nose! That was frikken rockass!" or "Oh my god, you look totally rockass tonight."
by Tasty Dish March 30, 2006