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1.
Rumpy bumpy is a euphemism for sexual intercouse.
"Me and your grandma iz gonna meet up tunight for a bit of rumpy bumpy."
door Herbert Wumpermire 9 mei 2008
 
2.
Rumpy bumpy is a euphemism for sexual intercouse.
"Me and your grandma iz gonna meet up tunight for a bit of rumpy bumpy.
door Herbert Wumpermire 7 mei 2008
 
3.
Yet another term for sex.

This is generally said by people who are afraid of saying the 's' word as they have spent the first four decades of their pitiful lives stuck to their mothers nips.
Ted: "Did you see that new adult site?"
Phil: "Yeah, I got some great rumpy bumpy viedos of it."
door Dave Esquire 22 februari 2006