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1.
A woman who has large pussy flaps (lips) so large and loose that when she walks it makes a clapping noise.
No doubt, she has Flap Clap, I heard that chic from around the corner, clap, flap, clap, flap, clap, clap, flap, clap
by CrunchyCritter July 17, 2011
 
2.
1. rushing trapped air inside the vaginal cervix causes a mini 'boom,' which sounds like an applause after a well-intentioned, proper fornicating

2. advanced stage of gonorrhea
Audrey: "did you hear that?"
KC: "yeah, i think you just flapclapped"

...a little later...

KC: "you need to have your flapclap checked"
by original prankster March 20, 2009