(N) A whore. Derived from the region
of the vagina called the labia.
The term flap is mostly used to describe
any slut, skank, bimbo, man/whore, player, skeez, etc.
Recently, however, the term may describe
a social event
It can be followed by a series of adjectives including, but not limited to: loose, big, little, stinky, sticky, pink, gross, etc.
"Do you see Marie over there excessively kissing her new boyfriend. That woman is quite the flap."
"Yes, he began
flirting with me many times today. That guy is totally
"Oh Em Gee. Nobody is attending this
social gathering. This
party is such a flap."