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English definition of “not be a happy bunny”

not be a happy bunny

UK humorous
to be annoyed about a situation: Her computer crashed an hour ago and she's lost a morning's work - she's not a happy bunny at the moment.Feeling sad and unhappyAngry and displeasedBad-tempered
(Definition of not be a happy bunny from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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