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1. An Ashtray ass is considered to be an ass that is so large that, you would be able to set an ashtray on it while fucking a chick from behind.

2. The side view of a woman with an Ashtray ass would have a shelf type look to it. So as to rest an Ashtray on the top of it.
John: "That's a fucking Ashtray ass if I ever saw one!"
Dick: "Fuck yeah I tossed one on there last week when I was owning that ass!"
by Blue Diablo August 16, 2008
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