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English definition of “you're having a laugh”

you're having a laugh

UK informal
used to show that you think that what someone has just said is not reasonable or fair: £500 to cut down a tree - you're having a laugh, mate!Unfairness and favouring someone unfairlyJustice and fairness
(Definition of you're having a laugh from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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