you/he/she must be joking

idiom

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 had to be there

you haven't lived

you have no idea

you/he/she must be joking

you know something?

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de rigueur

required by fashion, etiquette, or custom

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