smut

Soot.

(disapproving) Sexually vulgar material; something that is sexual in a dirty way; pornographic material.

(disapproving) Obscene language; ribaldry; obscenity.

Any of a range of fungi, mostly Ustilaginomycetes, that cause plant disease in grasses, including cereal crops; the disease so caused.

A flake of ash or soot.

Bad, soft coal containing earthy matter, found in the immediate locality of faults.

(slang, no longer used) A copper boiler.

To stain (or be stained) with soot or other dirt.

To taint (grain, etc.) with the smut fungus.

To become tainted by the smut fungus.

To clear of the smut fungus.