A long period of male masturbation generally watching porno films. Sometimes the man will squirt his load on a models picture.
Today I think I will have a Jackathon as I have a big load to shot on her face.
by blowmenow February 05, 2008
2 more definitions
Top Definition
Masturbating over and over usually more than 3-5 times a day.
Yesterday I had a major Jackathon since no one was home.
by Danny Bregman April 29, 2006
Where you see how much you can jack off in one day before you can't get an erection anymore.
Hey Ryan wanna do a jackathon?
Me: Fuck yea, I'll be sure to stay stiff the whole time
by ItsMaybeEthernet March 27, 2015

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