Meaning of “that (really) takes the biscuit” in the English Dictionary

british dictionary

"that (really) takes the biscuit" in British English

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that (really) takes the biscuit

UK US that takes the cake informal

You say that something or someone (really) takes the biscuit when it or they have done something that you find extremely annoying or surprising:

And you say she's opening your letters now? Oh, that really takes the biscuit!

(Definition of “that (really) takes the biscuit” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)