Some one who masturbates to much.
Fred is a total monkey slapper
by assjugs July 11, 2008
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When you whack off in the car while your mom is in the supermarket shopping.
Hey,I saw Zak in the supermarket parking lot doing the ol' Super Market Monkey Slapper! And he smiled at me, that sick fucker!
by ben de la cruz March 30, 2005
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