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Hygienically challenged, usually overweight, people can develop a residue of body secretions on their person, typically in compressed areas of the body described as "folds". It can also accumulate in the groin. This filmy substance has a distinct and unpleasant odor. Like crap.
I would go on a date with Tina, but damn she smells like flap crap. I don't want to get that stuff on my hands.

I gave Cortney a lift home, now my whole car smells like flap crap.
Flap Crap by WillieWonka12 January 30, 2010
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crap flap 

The small slivers of flesh surounding
a back door/shitter
wow, that girls got one large set of crap flaps
crap flap by sQuick June 25, 2003

Crap Flap 

A world for the buttox and inner areas of the body.
"You take it up the crap flap bro!"
Crap Flap by aledluap September 1, 2009

flap crapper 

a man that derives sexual gratification from defecating on his partner's labia
she discovered colin was a flap crapper when she woke one morning to find she was having intercourse with a gigantic turd
flap crapper by theWestHamfan January 12, 2004