Source : Webster's Revised Unabridged Dictionary (1913)

Smutty \Smut"ty\, a. [Compar. {Smuttier}; superl. {Smuttiest}.]
   1. Soiled with smut; smutted.

   2. Tainted with mildew; as, smutty corn.

   3. Obscene; not modest or pure; as, a smutty saying.

            The smutty joke, ridiculously lewd.   --Smollett.
      -- {Smut"ti*ly}, adv. -- {Smut"ti*ness}, n.

Source : WordNet®

smuttiness
     n 1: the state of being dirty with soot [syn: {sootiness}]
     2: obscenity in speech or writing [syn: {dirtiness}]