A term often used amongst cullinary circles, a roast beef vagina consists of taking the following ingredients:

1 Wide-Set Vagina
2 lb. of roast beef
1/2 cup of mashed potatoes
A pinch of camel toe
And one large helping of Mama's Homestyle Erotic Gravy

Insert the ingridents into your girlfriend/date/sister then mix well with your tongue.

to tell someone to calm down and relax.

A vagina with labia that look like they came straight from an Arby's beef n cheddar.

When the female vagina resembles a few (3 or more) then slices of roast beef, often giving off a foul odor of dog shit.

Roastbeef Vagina can be defined as a womans vagina that has the appearance of a wet, or moist, pink roastbeef. It may have you thinking Arby's.