look up any word, like lemonparty:
 
1.
Term used to describe a butt that mesmerizes you with it voluptuousness but ultimately only meets your lowest expectations
Laden with crabs and herpes sores, Crystal had quite the imposterior

Tom had to cut his night short after he found out his acquaintance from the club had an imposterior,
by BlazinVagrant November 13, 2011