Meaning of you must be joking in English:

you must be joking

(also you have to be joking)

phrase

informal
  • Used to express incredulity about someone's actions or claims.

    ‘same day delivery service—you have to be joking’
    • ‘Phone the bank instead? You are joking—you get into one of those endless loop answering machines.’
    • ‘I tell the tourists something costs 15 million and they say I must be joking.’
    • ‘When I was told we had not been accepted, I thought they must be joking.’
    • ‘This year we've rented a cottage. Tent? You must be joking.’
    • ‘"You owe me seventy-five bucks," she said. "You have to be joking," he replied with a nervous laugh.’