Top Definition
A challenge between two or more cumdumpsters in an attempt to become the ultimate ejaculatory fluid swallowing and bathing slut. These competitions can last days, maybe even weeks.
"Sasha was victorious in the last cumathlon after receiving over 9000 facials and swallowing around 20 gallons of sperm."
by ElDanio December 01, 2008
5 Words related to Cumathlon

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