Top Definition
When several males get together and proceed to, as fast as they can and at the same time, cum on a piece of bread. The last one to cum fully on the load-- err, I mean loaf of bread has to slowly eat it, in front of all of his friends, while they, laughing hysterically, take videos on their cell phones.
Duuude look at this picture of our cumathon yesterday; Jerry ate that whole fucking loaf of bread!
by Frank Dizzy September 22, 2008

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