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2.
a slang term for vagina
ian: dude, remember that girl from my little brother's birthday party? i saw her flapjacket!

eric: i envy you, you're such a sexbeast.
by e*rex January 13, 2004
 
1.
See "Flap"

A flap jacket is a condom, but not just any condom... You must refer to pussy as flap in order to call a condom a flap jacket.

Flap :: Pussy
Flap Jacket :: Condom
"My roommate was digging through all my drawers, cause he was out of flap jackets"

"Melissa might be a keeper. She doesn't mind football, loves Old Chicago and doesn't make me wear a flap jacket"
by Dirk Daddy August 14, 2011