To strike with the fist.
Example: "...may not score a point with his open hand(s), but may score a point by fisting the ball. damian cullen. "running the rule." the irish times 18 aug 2003, pg. 52."
To close (the hand) into a fist.
To grip with a fist.
To fist-fuck.
To break wind.
(in combination) having some specific type of fist.