A chick's ass that is so nice you automatically know she's got a smokin' hot, extremely tappable vagina.
John: Dude that chick at the club the other night was hot as fuck! She had a back like I've never seen before.
Brian: Yeah bro she definitely had a coochie-ass.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi