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When one tells a joke only to please themselves. The masturjoker often intends to please a crowd with their joke, but ultimately fails, and is the only one laughing.
Adam: "Man Alex thinks he is really funny, masturjoking over there. No one gets his humor."

Jess: "Well you always tell him to try out his jokes on kids first!"

Alex *laughing* "Oh man I'm so funny!!"
by Icebiker March 03, 2011
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