Meaning of “you're joking!” in the English Dictionary

british dictionary

"you're joking!" in British English

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you're joking!

B1 something you say to show that you are surprised by what someone has said, or do not believe it is true:

"Hey, Maria's leaving." "You're joking!"

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