Definitions by theflapmaster

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