flapping 

shaking one's willy in an eccentric and exciting manner. often resulting in hilarious and wet consequences. can be used as a form of foreplay or to attract other people to engage in the mating process, much like a peacock displays her feathers to attract a mate. a male human will often display his willy in an appealing way to gain sexual prowess.

i am going to use my extreme flapping capabilities to attract a mate at the club tonight.

flapping by sfccurtyla November 11, 2013

flapping 

alternate word to describe jabbing a nice booty

k-malz: i was flapping that booty at the gyzam
deemo: douchebaggg
enlo: spit roasttt meee k-malzzz

flapping by perthlover321 June 26, 2009

flapping 

The act of eating a girl's pussy aggressively- similar to motorboating but down below

Present tense
"What you up to dave mate?"
"nothin' much, just flapping the shit outta my girlfriend"

Past tense
"Alright dave?"
"Yeah mate just flapped the shit outta my girlfriend last night"

Future tense
"whatcha doin' tonight dave?"
"gunna flap the shit outta my girlfriend mate"

The process is remarkably similar to the gif below

flapping by maddogdave May 15, 2016

Flapping 

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."

Flapping by theflapmaster December 18, 2013

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.

Flapping by SnowGirl October 2, 2014

flapping 

hovering around, not really doing much

yo, stop flapping about

flapping by nark November 5, 2006

Flapping 

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!

Flapping by Lotta fra Bråkmakergata August 16, 2007