Smut

a black colloidal substance consisting wholly or principally of amorphous carbon and used to make pigments and ink

destructive diseases of plants (especially cereal grasses) caused by fungi that produce black powdery masses of spores

any fungus of the order Ustilaginales

an offensive or indecent word or phrase

creative activity (writing or pictures or films etc.) of no literary or artistic value other than to stimulate sexual desire

make obscene

stain with a dirty substance, such as soot

become affected with smut

affect with smut or mildew, as of a crop such as corn