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
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug