Definitions by JoeBroFoSho

Fist Pump Momentum 

The force of physics enacted upon ones arm after fist pumping for an extended period of time that causes one to continue fist pumping for a long period of time after. Can last anywhere from hours to days depending on the severity of the fist pump.

Artur: Why are you still fist pumping, its been days since that party ended.
Joe: Can't bro, I've got fist pump momentum.

Fist Pump Momentum by JoeBroFoSho September 19, 2011