smut /smʌt/ BrE AmE noun
[ Date: 1600-1700 ; Origin: Perhaps from smot 'dirty mark' (16-19 centuries) ]
1 . [uncountable] books, stories, talk etc that offend some people because they are about sex:
I won’t have smut like that in my house!
2 . [uncountable and countable] dirt or ↑ soot (=black powder produced by burning) , or a piece of dirt or soot