Oxford English Dictionary. Scatology. 1. That branch of science which deals with diagnosis by means of the feces. 2. That branch of palæontology which treats of fossil excrement or coprolites. 3. Filthy literature Scatological. Of or pertaining to scatology; characterized by a preoccupation with obscenity.
Wikipedia. "toilet humor"; off-color humor, a.k.a. vulgar humor or crude humor
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