Top Definition
The sexual act of inserting ones fist into a woman's vagina and the other fist into her anus and then knocking your knuckles against each other through her flesh
-Dude, I was knocking fists on this chick last night...
-Oh man, did you stretch her out good?
-Hells yeah!
by 47 March 31, 2006
5 Words related to knocking fists

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