Top Definition
A ridiculous challenge between male friends to determine who can ejaculate the most times within 24 hours.
Guy 1: I bet you guys can only jack off twice before you can't anymore!

Guy 2: Why don't we have a spermathon to determine who can do it the most!
by wanker69 February 04, 2012

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

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

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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