extra skin around labia that sticks out like wings from the actual pussy hole...resembles shaved roast beef like you would find on a sandwich from Arby's
she was hot, but her vagina had roast beef butterfly
by braindead cant bowl September 05, 2008
1 more definition
An external Labia (Pussy Lips), when pulled out when legs are spread it looks like a butterfly made out of roast beef!
That chick has a roast beef butterfly!
by 1974Jimmy. November 20, 2006