Definition of you/he/she must be joking
—used say that what someone is saying is very surprising or hard to believe "He said the report is due by tomorrow." "He must be joking."
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“You/he/she must be joking.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/you%2Fhe%2Fshe%20must%20be%20joking. Accessed 7 Mar. 2021.
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