Flapanny

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!