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
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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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