To demean someone, abusing them verbally by relating them to a coochie. Essentially calling them a pussy.
"Don't come at me wrong with your coochie-ass."
"Get out my car before I beat the shit out of your coochie-ass."
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.