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 November 17, 2007
Get the open faced roast beefmug. by hr-rp January 5, 2007
Get the Open-faced roast beef sandwichmug. 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 8, 2011
Get the Open-Faced Roast Beef Sandwichmug. 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 20, 2003
Get the open faced roast beef sandwichmug.