Top Definition
Doing math homework or writing a math portfolio (especially for IB) that is so EXCITING that you feel sexually stimulated in the process and have an orgasm once you're done.
Alan: Sorry man, I can't go see "I Am Legend" with you guys tonight because of this stupid IB HL Math Portfolio on the Koch Snowflake that I have to write...

Barzeen: Don't even bullshit me, Alan, I know you're just gonna jack off all night anyway.

Alan: Well, you're kinda right. I'm gonna mathturbate.
by aredotwice December 16, 2007

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