Define Fist Up Meaning

Fist Up
To push one's fist right into another's asshole. This is also called an JAM UP. Normally used in times of extreme agressiveness. Males in particular detest this as it enlarges the rectal passage by up to six times.

A: Did you see Tom yesterday?
B: No, he skipped school to miss the maths test.
A: I could give him a fucking fist up.
B: Here, let me give you one, you foulmouthed bastard.
A: MOM?!?! NO NO NO! AAAAAAAAAAAAARGH!!!
By Jess
Right Fist Up In The Air
A way of showing Black Power without shouting it.

Yo we don't need to shout black power. When the Labor Day Parade happen again, just put your Right fist up in the air; they'll know what time it is.
By Carma
10,000 Fists Up Corporate Music's Ass
When an alternative rock band, once hitting it fairly big due with an original sound, sells out out to a more pop-y sound to sustain fame

Disturbed's old albums were amazing, but their new stuff has totally joined the 10,000 Fists Up Corporate Music's Ass
By Mariann