Top definition
Emptying your used condoms in somebody else's shoes. Typically done if the victim of the Cincinnati Shoe Shampoo interrupted a sexual act of the perpetrator or did something equally as offensive to the perpetrator.
Dude #1: "Your friend busted in on me and my girl doing the nasty so I gave him a Cincinnati Shoe Shampoo this morning."

Dude #2: "Gross dude, his feet probably smell like a protein shake now."
by Danny Torrenance's Finger January 14, 2009
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