Definition & Meaning of "snot"in English

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

"Snot" is a slang term used to describe a person regarded as contemptible, childish, or obnoxious. It comes from the literal meaning of "snot" (nasal mucus), which evokes dirtiness, unpleasantness, or immaturity, and has been used metaphorically in English since at least the 19th century. The term is often applied to children or irritating individuals in informal, teasing, or mildly critical contexts. It is mildly derogatory, usually playful or scolding rather than deeply offensive.