(verb) (1) The act of laying upside down in a shower or bathtub with your legs up the wall and drowning yourself while masturbating. (2) A form of sexual warfare whereupon the victim is both waterboarded and given a handjob.

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"John threw out his back last night while masturboarding himself"
by Masterboarder February 14, 2019
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the act of masturbating on a keyboard and leaving the remnants dry.
I just totally masturboarded on that dudes keybaord.
by Zeinzu July 31, 2009
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