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

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.