The excess labial skin around a female's vagina, often created by repetitive insertion of penises, namely large ones. "Beef" refers to the often brown hue of drapey labia majora. An argument can also be made for the "nature vs, nurture" of beef drapes, as some women are born with a relatively "beefy vag". However, the most beefy vaginal drapes are most often the product of both birth and repetitive pounding.
Last night I was about to go down on this girl, when I realized she had massive beef drapes sprouting from her cunt. Honestly, I almost threw some some Arby's sauce on that bitch, she had a fucking Big Montana surrounding her vag piece.