The state of mind resulting in an action that a person, usualy male, feels when forced to attend a math class of any kind. They become bored sitting in the back of the class and feel the need to undo/remove their pants behind the math textbook. They then partake in some enjoyable activities resulting in self satisfaction that helps them to survive the remainder of the math class.
Kevin: "Whats Sean doing back there?"
Nathan: "I dont know, but is it raining in here??"

Sean: "That was a good mathterbation guys." *Zip*
by DocAfroman March 1, 2010
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Doing math for fun, enjoyment, entertainment and/or to pleasure ones self.
Dude1: Hey! whats that nerd over there doing with that calculator?
Dude2: Probably mathterbating
Dude1: Dude! sick he could at least go to the bathroom to do dat
Dude2: Gotta do what you gotta do
by SeakingFuckYeah! March 4, 2008
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Mathterbate or mathterbating is the act of masterbating instead of doing your math homework.
"Johnny why isn't your homework complete"said Mrs. Jones. Johnny said "I tried to do it, but I had to mathterbate to your picture all night."

All that fine booty in class had me mathterbating during lecture
by Brando-The-Hutt February 15, 2016
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