euphemism for anal sex, often misinterpreted as a euphemism for sex in general
bored of regular sex, jeremy asked susan if she would mind him pumping her rump.
by Chairwoman Mao Mao February 4, 2004
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Anal sex. Specifically, heterosexual anal sex between a man and a woman.
She ate White Castle for lunch, so I had to wash my dick off real good after giving my bitch the ol' Rumpy Pumpy.
by TrueDolFan November 16, 2007
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The kind of sex midgets have. When two midgets screw, their asses look bigger than their faces.
Papa Smurf: "Hey Mama Smurf, hows a little Rumpy-Pumpy?"

Mama Smurf: "Fuck off, I'm masturbating"
by cottagecheese June 3, 2010
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