Question

what is meant by smut

Answer 1

1. a small dark smudge or stain, esp one caused by soot

2. a speck of soot or dirt

3. something obscene or indecent

4. (Plant Pathology)

Answer 2

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In refer to science SMUT usually means Ustilago esculenta a species of fungus in the Ustilaginaceae, a family of smut fungi.

But

SMUT is a genre of books or writings also called "smutty" this genre is a part of romance which is related to physical contact or spicy content. This meaning is more considered in English literature.