Definition & Meaning of "varmint"in English

What is the origin of the term "varmint" and how is it used?

"Varmint" is a slang term for a person who is troublesome, irritating, or contemptible. It comes from the alteration of "vermin," which originally referred to pests or animals considered harmful, and was extended figuratively to describe people behaving badly or causing trouble. The term has been used in English since at least the 18th century and is common in rural, American, and informal speech. It is mildly derogatory, often teasing or critical, and generally not highly offensive.