you must be joking
also you've got to be jokingB1 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!
Thesaurus: synonyms and related words
Not believing
- are my eyes deceiving me? idiom
- as if! idiom
- authority
- believe
- believe sth when you see it idiom
- denial
- have something on good authority idiom
- I'll eat my hat idiom
- iconoclastic
- in your dreams! idiom
- incredulous
- joke
- Marines
- quarrel with sth
- salt
- satisfied
- self-deception
- since when idiom
- take sth with a pinch of salt idiom
- worship
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