A way to describe a sexual partner that, during the act of coitus or anal, the penis is inserted into the orifice with more force than is normally applied, usually someone who does this frequently. This usually refers to the one inserting the penis, but this can be applied to the one who is getting the penis inserted into themselves should they mount it with extra force.

Derived from punching the monkey, since this is the name of the act itself.
Honey, you're a monkey puncher if I ever saw one. You don't need to assault the balls just because you're getting down and dirty! Ease up on it, okay, you gotta go more softly!
by 9kirby99 January 18, 2019
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Someone stupid enough to click banner ads, i.e. the ad encouraging you to punch the monkey to win.
His PC is all clogged up with spyware because he keeps clicking on banner ads. What a monkey puncher!
by RealityCheque April 25, 2008
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Someone who looses at all contests and give-aways
I'll never win sxephil's give-aways because I'm a monkey puncher!
by Buttface65436 August 5, 2011
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