Knuckle Pump

When u and a friend make fists and touch um together, kinda like a handshake but more modern

Dude1: Did u get that new video game dude?!
Dude2: nah man, im saving up to take my GF to the movies
Dude1: wise man! *knuckle pump*

by Darth Tater October 14, 2005

Pumping Knuckles

When one commits the act of fappage on one's own beastly piece.

Dude: Hey, you wanna hang out?

Dude (other): Nah, I'm pumping knuckles.

by arroni January 22, 2010