The slapping of the scrotem on ones inner thighs.
Do you have a bag case of knockin' nuts?
by Chris&Annee February 17, 2021
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To bump into another man's testicles with one's own testicles, whether intentionally or not, when one is double-penetrating a woman with another man.
The idea of a threesome intrigues me, but the chance of knockin' nuts with another dude turns me off.
by xray233 August 11, 2007
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When a man who has testicles, swings his scrotum sac from left to right in a fit of joy.
Chaz was knockin' nuts when Beyonka agreed to suck his twinkie-cream.
by Jerome June 17, 2006
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