a widely used, somewhat impolite, slang term for a woman's hymen, a piece of skin which covers the opening of the vagina and, contrary to popular belief, can be broken in any number of ways including sexual intercourse, tampon use, and vigorous exercise. It's presence, or lack thereof, was at one time used to prove or disprove a woman's virginity, but we now know that this is an archaic idea, as it can be broken in several ways, and many women are in fact born without one.
Idiot: "Dude, that bitch told me she was a virgin, but she didn't bleed when I did her last night. Somebody else must have got to her cherry first."
Less-of-an-Idiot: "Um, maybe she just uses tampons or something."