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The act of cunnilingus while the receiver defecates on the toilet, thus leaving a streak of feces between the chin and lip of the performer, which resembles Howie Mandel's soul patch from the mid-00's. Analogous to the blumpkin.
Emily: I heard Brian gave Tiffany a mean muddy Mandel for their one year anniversary!

Stephanie: Tiffany's so lucky - she found a keeper for sure.
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by THEbigAGGIE May 22, 2017
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