Top Definition
A testicle removed from the sac and bounced like a bouncy ball.
Jim was playing with his ballnut all day.
by nunny SAC September 24, 2010
The conglomeration of Ball, Nut, and Uber-Goodness.
When Tom poops his butt his ballnut gets the sizzurp on it.
by M0rty June 30, 2008
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