What does Ashtray ass mean?

Ashtray ass meaning in Urban Dictionary

1. An Ashtray ass is considered to be an ass that is therefore big that, you'd be able to set an ashtray on it while fucking a chick from behind. 2. along side it view of a female with an Ashtray butt might have a shelf type look to it. In order to rest an Ashtray on top from it.