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.
Joe: Can't bro, I've got fist pump momentum.
by JoeBroFoSho September 19, 2011
Get the Fist Pump Momentummug. The sexual act of pulling your arm back and punching your fist up your partners anus in a celebratory manner. The arm must be inserted up to the elbow or it is only considered a Bill Murray swirly. This is usually accompanied by a reach around.
by Pope Big Ron Don John II December 30, 2022
Get the Tiger Fist Pumpmug.