A condition where a girl has a pussy so loose you can fit a damn watermelon in it. It also usually smells of dead fish and generally has lips that sag out of her pants.
George: Dude I totally banged Megan last night!
Ryan: Wtf dude she has the flap!
A style of dance created by The Redd Zown. Performed by releasing the shoulders while "flapping" one's hands and arms to the beat. Term could also be used in any sentence in place of a verb.
"The ladies love when Rob Cahill does the flap in the club"
"I flapped the bitch in the face"
"Do you mind if I flap around the car a little bit?"