smuts

Obscene or vulgar jokes, stories, or pictures.

"He was telling smuts at the pub."

Small marks or stains caused by soot, dirt, or grime.

"The window pane was covered in smuts."

A fungal plant disease causing black powdery spores on crops.

"The wheat crop suffered from smuts."

To mark or stain something with soot or dirt.

"The old lamp smuts the ceiling."