(noun) A dirty, stank vagina with long, stretched out, gray labia usually from being worn the hell OUT. A high probabiltiy of being a carrier for multiple STDs.
Bitch, please...you need to take 'yo nasty Roast Beef with Cheese to the clinic and get some antibiotics!
To model ones beef is to place thou cockus in thee mouth and pose for the camera
SexPhoneOperator: Hey baby...
HornyMan: Would you like to model my beef?
SexPhoneOperator: oh fo' shizzle my nizzle...
HornyMan: aight then model it bitch