The art of smacking your erect penis against your inner thigh to the point of climax.
"I walked in on my brother flapping and listening to the audio of a slaughterhouse."
"I had to rip out all the leg hair on my thigh because they were covered in cum from me flapping."
The act of female masturbation. The female version of 'fapping' with reference to the flaps of the vagina.
Girl, I was flapping all night to fifty shades.
Summer to-do list: Slip, slop, slap and flap.
When a naked man swings his hips from side to side - causing his penis to alternately hit each of his thighs, going from side to side.
He was standing there in the shower, singing and flapping!
Female equivalent of male fapping or 'masturbation'
That lady is always Flapping about at lunchtime. Dirty.
For a woman to stand legs apart or even legs akimbo and swinging her hips side to side. So called because this movement can cause a woman, usually an older one, to produce a flapping sound as her lips hit eachother.
Egad!!! Marjorie is flapping on the dancefloor!