Fist pumping is when a group of guidos get together and hit the club. Once they're there, they stand in a circle, and swing their fist up and down to the beat of the music.
Half the hand, then ball your hand into a fist, make sure you don't have any rings or watches on. Use lube, like crisco or lotion. Then massage the anus. Make sure to go to the bathroom and clean out...
you can do 3 things. 1) Run away and hope they don't run after you. 2) try and talk to the other person and make peace. 3) Get ready for a fight and hope your not the loser.