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A sexual act whereupon a man is fucked up the ass and then shits the cum and feces mixture onto the chest of his partner. The partner is then laid out in the sun with the mixture spread thin across his chest. As the sun dries the mixture, it becomes crusty. Then you punch him in the dick.
I gave your father a crusty Uncle last night.
by UncleBarry June 08, 2018
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