Kneeballing is when the knee is used to inflict pain on a mans testicles whether for sexual fun or self defense, derived from tamakeri/ballbusting. Practiced by many as an introduction th ballbusting.
My gf was giving me serious kneeballing last night.
by Drew1977 January 14, 2016
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the place under your knee that when it gets hit it feels like you got kicked in the balls. Except on your knee.
Fuck you Clyde, you hit me in the kneeballs.
by chaddaddy69 August 26, 2008
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