Top Definition
n. to spend hours upon hours masturbating
"dude, what'd you do last night?"
"nothing, man. i sat on the couch all night and had a masturbatathon."
by SelenaG October 12, 2007
When a group of people go hours on end masturbating.
The annual Masturbatathon is a charity event.
by masturbatathoneer! August 10, 2012
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