The act of repeatedly inserting and retracting a clenched fist at Bruce Lee speeds.

Usually into a bodily oraphis with out lube. If executed correctly uncontrollable bleeding will occur.
"I just got arrested for power fisting my girl friend, she got taken to ER"
by gazinlar November 5, 2011
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Perhaps one of the coolest weapons ever to come from the game Fallout. Used to deliver hand-to-hand death to anyone foolish enough to stand in its way.
"We're gonna kill you."
"Oh, yeah. Well, feel the might of my POWER FIST!!!!!!!"
by Snake December 6, 2004
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Beating someone or something senseless with a mechanical fist.
Oh man, I just got done power fisting, I'm exhausted. I think I'll go take a nap.
by Jon X6 December 3, 2008
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After his inaugural address, Trump raised his fist in a gesture resembling the Black Power Fist, but clearly meaning something different.

This time, it signals that the oppressed and maligned Super-Rich are finally claiming their rights to OWN IT ALL!
When we saw Der DrumpfenFührer raise the Trump Power Fist, we should all have known that now we're truly fucked.
by Nikolai Peterson February 2, 2017
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When Your recording a video and your friend asks what his melee is
Friend: How do I use my fisting powers, WAIT!

Everybody Else: *Dies Laughing*
by TTTbbbbbT March 25, 2018
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