An idiomatic slang term for someone who is headstrong, ungovernable, or difficult to control — a person who talks back, refuses to be reined in, and says exactly what they think regardless of the consequences. The metaphor comes from horsemanship: a 'hot-mouthed' horse resists the bit and is hard to control, and the same quality in a person suggests wilful, opinionated, combustible energy. It's an evocative if old-fashioned way to describe someone whose mouth runs faster than their good sense.
The new recruit was talented but hot-mouthed, constantly arguing with senior officers over decisions that weren't his to question.
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(slang, idiomatic) Headstrong or ungovernable.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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