Top Definition
When you hump a pillow, bed, woman, etc., and you put your hand by your penis so that as you hump up and down, your hand rubs against your penis, giving you the sensation of masturbating while you are humping.
I was so horny after watching the shake-weight commercial that I decided to have a quick masturhumping session.
by Masturhumper December 29, 2010

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