"the eating of feces," 1875, originally in reference to insane persons or animals, from Modern Latin coprophagus, from Greek koprophagos "dung-eating," from kopros "dung" (see copro-) + -phagos "eating" (from PIE root *bhag- "to share out, apportion; to get a share"). Related: Coprophagous "feeding upon dung or filth" (1826, in reference to beetles); coprophagic (1876); coprophagist (1887).
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