Word Origin & History
smut1664, "black mark, stain," from verb smutten "debase, defile" (early 15c.), cognate with M.H.G. smotzen "make dirty," from W.Gmc. *smutt- (cf. M.H.G. smuz "grease, dirt," Ger. Schmutz "dirt," Ger. schmutzen "to make dirty"). The meaning "indecent or obscene language" is first attested 1668 (implied in
smutty).