Flappany (Pronounced Fla-Panny) is the definition of the unfortunate sight of an enlarged and saggy labia between a females legs.
Dave: Bro, I went down on Jade last night, she was huge! Could have fit my head in there!
Carl: Mate that girl must have a Flapanny!
Dave: You know that! She'll be flapping in the wind for days!
N: in which a man's head is tucked into the largest flap of flabby skin on the loagiest, fattest hooker one can find. Once head is tucked, it is henceforth jiggled around in the flap. Flapdance.
Jay: Hey, my boy's having a bachelor party this friday, I want to play a prank on him.
Sam: Go give Fat Linda a call and get that man a flapdance.