Definition & Meaning of "vonce"in English

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

"Vonce" is a slang term for a person regarded as contemptible, worthless, or despicable. It appears in late 20th- or early 21st-century English, likely emerging in online or youth subcultures as a coined insult with no obvious literal origin. The term is used in informal, hostile, or mocking contexts to denigrate someone, often online or among peers. It is strongly derogatory, never neutral, and conveys clear contempt.