Top Definition
When one of a male's testicles is smaller than the other - is a reference to finding nemo in which one of nemo's fins is smaller than another.
she unzipped his jeans, pulled down his briefs and was suprised to find a nemo-ball next to his normal sized ball.

the jock was extremely insecure about his nemo-ball, but chicks loved it.
by bee56 October 23, 2007
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