Definition of smut noun from the Oxford Advanced Learner's Dictionary

     

    smut

     noun
    noun
    BrE BrE//smʌt//
     
    ; NAmE NAmE//smʌt//
     
     
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  1. 1[uncountable] (informal) stories, pictures or comments about sex that deal with it in a way that some people find offensive He can entertain audiences without resorting to smut.
  2. 2[uncountable, countable] dirt, ash, etc. that causes a black mark on something; a black mark made by this His face was covered with smuts from the engine.
  3. Word Origin late Middle English (in the sense ‘defile, corrupt, make obscene’): related to German schmutzen; compare with smudge. The noun dates from the mid 17th cent.
See the Oxford Advanced American Dictionary entry: smut