Definition & Meaning of "dumbnuts"in English

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

Dumbnuts is a slang term that appeared in mid-20th-century English to describe an incompetent, foolish, or stupid person. The term combines "dumb," meaning lacking intelligence, with "nuts," a slang term for a person (often implying silliness or foolishness), intensifying the insult. Literally, it labels someone as foolish or incompetent. Historically, it was derogatory and informal, used to mock or ridicule someone's inability or stupidity. Today it remains informal and mildly offensive, mainly used in casual, humorous, or critical contexts rather than polite conversation.