Take yer pick
1.a particle of soot; sooty matter.
2.a black or dirty mark; smudge.
3.indecent language or publications; obscenity.
4.Plant Pathology. a.a disease of plants, esp. cereal grasses, characterized by the conversion of affected parts into black, powdery masses of spores, caused by fungi of the order Ustilaginales. b.a fungus causing this disease.
–verb (used with object)
5.to soil or smudge.
–verb (used without object)
6.to become affected with smut, as a plant.