Waving one's clenched fists around in the air (usually done while pissed off) while screaming and yelling at someone or something, thus appearing to be an angry monkey.
I cut some guy off in traffic today and he got out of his car and started monkeyfisting.
by Jen Brauer May 06, 2010
When a guy is so old that his balls hang low enough to drag on the ground like a monkey whose knuckles are just dragging behind him as he walks. Another phrase for Old Balls
HA YOU'RE 21?!?!?! MAN YOUR BALLS ARE SO MONKEY FISTING.
by Q?Z? July 22, 2009