Oversized, over-used, stretched out vagina lips, hanging from the crotch area, resting on the inner thigh, as if to be an open faced roast beef sandwich.
When your at a party, you meet a chick, you stick your hands down her pants, and there's more meat in your hands than in hers. That's open faced roast beef.
by BT Cruiser October 30, 2007
by hr-rp January 4, 2007
That bitch's pussy is so used up it looks like she has a week old Arby's open-faced roast beef sandwich dangling from her crotch!
by frank from safeway July 7, 2011
a vagina
looking at a chicks pussy when you are about to munch on her box. If she is really excited it will have extra mayo...yummy
by Izaric November 21, 2003