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.
Synonyms for Fist Up
On this page, you will find 30 slang terms related to fist up. Some of the top words include: fisting, Brutonizing, ass punch, shove it, buggering, and 25 more.