Top Definition
When a girl is so thin, her ass cheeks don't touch.
Damn that ass gap is so wide, I wanna hit it from the backside.

Or

Omg! I've been working on my ass gap and now Billy won't lay off my asshole! I love it!

Or

Look at that ass gap. Bet its nothin but net, swoosh!
by Fatchickcrybaby March 30, 2014

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