raunchy booty 

when a boy or a gurls booty is so ugly and/or flat, it makes you want to puke.

Girl 1:Look at that guy over there, he's cute?
Girl 2:Oh, no he got a raunchy booty!!
Girl 1:You're right.

raunchy booty by k-neezy June 23, 2006

Booty Raunch 

Penatrative anal sex.

"George likes Laura to booty raunch him with dildoes."

Booty Raunch by PP April 29, 2002