Definition of “not be a happy camper” - English Dictionary

british dictionary

“not be a happy camper” in British English

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not be a happy camper

informal humorous UK also not be a happy bunny

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 camper at the moment.

(Definition of “not be a happy camper” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)