Varmint (noun)

1. An obnoxious or objectionable person.
2. A small animal, especially a rodent, that is considered a pest.

Origin:

Origin uncertain, possibly from the dialectal variant of vermin.

Examples:

1. The farmer chased the varmint out of his field.
2. The varmint dug holes in the garden.
3. I can't stand that varmint, he always causes trouble.
4. The varmint population has been growing rapidly in the city.
5. The hunters were after the varmint that had been damaging their crops.