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The act of defecating before a shower, but not wiping yourself clean because you use your hand as toilet paper as you take a shower. Only Italians and Jehovah's Witnesses do this.
Henry: Shit, out of toilet paper. Guess I might as well take a shower.

Pirate: Yar, even a salty mate like meself wouldn't tread the waters of a Dirty Henry.
by Danny Seagal April 12, 2006