b) The meaty lips you love to nibble on when you go muff diving
b) Hmmm pull on my flaps honey uhhh pull em ooooohhhh pull em!
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 or gathering.
It can be followed by a series of adjectives including, but not limited to: loose, big, little, stinky, sticky, pink, gross, etc.
"Yes, he began flirting with me many times today. That guy is totally a flap!"
"Oh Em Gee. Nobody is attending this social gathering. This party is such a flap."
"I don't think she's like that fit, but she's a flap"
"Her eyes don't really do it for me, she must be a flap"