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a happy camper
Someone who is happy or content. Often used in the negative to indicate someone who is particularly unhappy, irritable, or displeased. I could tell the producer was not a happy camper after Jake used such inflammatory language on the air. She was not a happy camper after her work permit application was denied. I just got a raise, so I'm a happy camper today.
(a) happy camper
a happy person. The boss came in this morning and found his hard disk trashed. He was not a happy camper.
A satisfied participant, a contented person, as in She loved the challenge of her new job; she was one happy camper. This expression is also often put in the negative, as in She hated the heat and humidity of the southern summer; she was not a happy camper. [Slang; mid-1900s]
n. a happy person. (Often in the negative.) I am not a happy camper. I am tired, hungry, and I need a shower.