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A hybrid from rump which refers to a woman's ass and the sound Reuber's camshaft made from his 74 whatever hot rod. Rumpo meaning sex, and one of the greatest bands ever, Rush. Add brush in there referring to a rump brush. This was established around 1986 or so. A fun word to look at and say.
Dude who sprayed Rumpobrush on my car door? COOL!
by Rumpobrush June 20, 2007
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