From Longman Dictionary of Contemporary Englishsmutsmut /smʌt/ noun 1 [uncountable]RUDE/OBSCENE books, stories, talk etc that offend some people because they are about sex I won’t have smut like that in my house!2 [countable, uncountable]BURN dirt or soot (=black powder produced by burning), or a piece of dirt or soot
Examples from the Corpus
smut• When pocketbooks are empty, the master said, brains fill with anger and smut.• There's too much violence and smut on TV these days.• corn smut• A 0 signifies harmless fun; a 5 means gore, smut, rough language or adult themes lurk ahead.• Proponents say the law would protect kids from on-line smut.• A little smut, it must be said, does go a long way.• I noticed the powder smut from the shot on the white skin around the wound.• Most countries would prefer to do without the smut and the anti-government invective, but none wants to risk being left out.Origin smut (1600-1700) Perhaps from smot “dirty mark” ((16-19 centuries)) 