generally found on extremly fat people, its a huge sagging boob, or a belly roll or rolls and other things that fit in this description above. when whalelike people walk around, these items apear to (flap), due to air resistance and gravity, much as a birds wings flap or a whale flipper flip and/or flap. sometimes these things all flap/flip at once. this could be called a fat man's disco. amazingly, u get all this action just from walking!
that man just walked across the street, but it looked like he was flipping/flapping/rolling because all the flaps and flips made it look like he was dancing, unintensionally. When he made a turn to the left, all his flaps and rolls made him look as though he had a superpower of turning into tornadoes or spining around while walking straight
by slapapig September 27, 2003
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The act of farting in someone's face, then immediately turning around and slapping them to bring them back to reality.
Jane kept running her mouth at me last night, so I had to give her the flap to let her know who the boss is.

Hey man, don't hang out with John, he's a flapper.
by bob_stencil January 19, 2011
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Female equivalent of male fapping or 'masturbation'
That lady is always Flapping about at lunchtime. Dirty.
by Tylers88 August 03, 2017
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Common term for labia majora, often used to express your sincere affection for a female acquaintance. For a stronger expression of appreciation it is common to add the prefix "piss-"
"hey girl, nice to see you, I'm just gonna get a drink and I'll be back to slam those flaps."

"hey Trixi, I told the rest of the team about your loose flaps and they wanted to check you out"
"hey boys, wassup"
"so, you cool if we all take a turn pounding those piss flaps"
"Hahaha, you can do anyfing you like"
"sweet, that's a good little skank"
by skumliterati March 11, 2015
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labia or failure... you decide
1. She had no knickers on and you could see her flaps

2. Sorry I didn't come out with you guys last night... I flapped it!!
by 123x April 20, 2011
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A hip alternative to pussy, box, snatch, and cutty. Flap refers to more than just the beef curtains, it covers all areas of one's womanhood.
"Me and DeAndre about to hit the town scouting for flap"

"I creased that flap last night dawg, and I didn't even have to wear a flap jacket"
by Dirk Daddy August 14, 2011
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