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Possible, but doubtful. This kind of accusation is often raised to discredit someone. Usually a political opponent. There is little to discredit about in Hitler as it is. He's about as low as one can get. (Together with Mao and Stalin, mind you.) No need to smear him with doodies.. ;-)

The above answer is incorrect. The wiki link refers to urolagnia. Which is the about the same, but with urine. Not with feces. A bit more common than a poop fetish. It doesn't mention Hitler in any way whatsoever.