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A variation of the Muddy Buddy. After vigorous anal sex, when there is a thin layer of fecal matter still present on the penis, the act of spreading the fecal matter around your sex partners booty, resulting in a brown spot that resembles a rabbit's dirty bushy tail.
After having anal sex with my girlfriend last night, I gave her a muddy bunny.
by Metallibun July 17, 2011
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