A semi-slang term used to describe one extreme of of possible possible of a woman's labia minora. It is characterized by a wavy shape of the labia with many wrinkles and fine crevices.
The opposite extreme is referred to as "rose petal."
It is important to note that while current fashion tends to favor labia near the rose petal end of the spectrum, there is nothing "gross" or "weird" about roast beef. Every vulva is a unique and special part of every women.
Other terms that describe the form of a women's labia include "innie" and "outie," both referring to whether or not the labia minora protrude from the labia majora.
"The flap of vag that extrudes from the lips. Thus giving the illusion of a roast beef sandwich. Thick beef or shaved, either way "bon appetit"
Adam: "Hey Leeroy, wanna get some lunch?"
Leeroy: "Nah man, had some nasty roast beef sandwich lastnight"
Adam: "Hanging with my sis again"
Leeroy: "Yeah!"
A heavily processed roast beefpressed into a loaf. When sliced, the roast beef has a slimy, iridescent appearance and has a distinctive squeaky feeling when chewed. This roast beef is commonly served in cafeterias and fast food restautants.
I can't eat fast food roast beef sandwiches anymore because they all use squeaky beef.