Webster's English Dictionary

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smut

1. smut \'sm*t\ vb or smut.ted;  or smut.ting [prob. alter. of earlier smot 
   to stain, fr. ME smotten; akin to MHG] smutzen to stain 1: to stain or 
   taint with smut  2: to affect (a crop or plant) with smut  : to become 
   affected by smut 
2. smut n 1: matter that soils or blackens; specif : a particle of soot  2: 
   any of various detructive diseases esp. of cereal grasses caused by para 
   sitic fungi (order Ustilaginales) and marked by transformation of plant 
   organs into dark masses of spores; also : a fungus causing a smut 3: 
   material treated obscenely or felt to be morally fouling