Meaning of “you must be joking” in the English Dictionary

british dictionary

"you must be joking" in British English

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you must be joking

also you've got to be joking

B1 said in answer to something that someone has said, meaning that you do not believe they need said it seriously, or you think it is a stupid thing to say:

You've got to be joking if you think I'm going to stand in the rain watching you play tennis!

(Definition of “you must be joking” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)