ass cravass 

the canyon defined by the curvature of two ass cheeks.

"I can't believe she fit the whole thing in her ass cravass"

ass cravass by Ass McCravass April 12, 2008

Ass Crevasse 

n. One who possess a large ass crack, usually offensive to the visual cortex.

"Whoa!!! Cover that Ass Crevasse up, plumber man!"

Ass Crevasse by The SplieveBDS September 19, 2013