A British idiom meaning thoroughly exasperated — past the point of patience with something or someone that has gone on too long. More emphatic than simply 'fed up,' the 'back teeth' intensifier implies being so full of annoyance that it has reached your furthest extremity. Common in conversational British English, typically used when tolerance has been exhausted.
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UK and Irish slang — Cockney, Scouse, Geordie, Yorkshire, Glaswegian, Brummie, Welsh, West Country, plus Irish English. Centuries of regional dialects feeding into modern British and Irish street talk.
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She was fed up to the back teeth with the same excuses every single week.
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(informal, UK) : very frustrated, annoyed, tired.
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