Short for the "urinal deuce". A U-Deu (U-Doo) is defined by the act of laying a deuce, or defecating, into a urinal.
i.e. All the stalls in the Men's room were occupied, so Aurthur found an open urinal and dropped a U-Deu.
i.e. Jeff was bragging to his friends that he'd taken a U-Deu in a port-a-potty urinal on a double dog dare.
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