-Adam and Jenn "walking" in the park.

Alex - whats Adam doing?
Party Arty- flappin' the flipstick
Alex - WHAT??
Party Arty - they're walking in the woods...
by P.Arty February 16, 2009
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When you are standing next to a speaker at a concert or a party and the power of the music makes your trousers move.

Happens more with bass bins. Coined by DJ Nark.
The music was trouser-flappin' last night! Whopper tunes!
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when a vagina is extremely loose that it flaps.
man i hope its not windy today, shelbys gunna be flappin in the wind
by Shelby && Alyssa February 11, 2007
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The act of not wearing underwear, for females. Just as mud flaps behind the wheels of a truck flail wildly in the wind, a saggy vagina may mimic this flapping motion without the restriction of underwear. This is the alternative to "free balling" meant for female use only.
"Dude, it's my laundry day, so I'm mud-flappin' it today."
by PACHFI May 5, 2010
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the involuntary body movements made after being up for more than 2 days on crack
please dont send kelly to the store... she is crack flappin all over the place.
by c~mamie November 9, 2007
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The official mating move and call of a female jailbird when seeking to pleasure a current, former, or pending jailbird
She always was flappin’ and yappin’ for those dudes with priors.
by RippinBuzzy February 11, 2021
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