Top Definition
A sexual act where one shoves his penis in another's ass and pulls it back out. If there is poo on it, he must go back in for 6 weeks.
Guy: "Have you seen Bill lately?"
Girl: "Yeah. My mom caught him reverse groundhogging my sister. Now he's stuck there for 6 weeks."
by Hilbeah Albion November 30, 2010

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The Urban Dictionary Mug

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