look up any word, like cunt:
 
1.
The act of pounding out a girl from behind.
I walked in the suite and he was crushing ass with that girl from the club. I gave him a high five fixed me a sandwich and left.
by Lewda February 26, 2008
 
2.
Slang term for sexual intercourse; can also refer to anal intercourse, specifically.

Origin: Motion picture "Old School," as per Vince Vaughn's chatacter in an alternate locker room scene that was left on the cutting room floor.
"...now he's crushing ass at every frat mixer..."
by talking goat June 23, 2003