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.
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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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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