(to be) a happy camper slang
A person who is pleased and satisfied with their state of affairs.
Last night, a thief broke into his house and stole his motorbike. He was not a happy camper.
I could tell you were not a happy camper after having to wait for such a long time, but you still couldn't buy what you wanted.
John confessed his love to the girl of his dreams, Mary. The confession was accepted. That's why he looks like a happy camper at the moment.
This term originated from the second half of the twentieth century and initially referred to a summer camp attendee. It is frequently used negatively, such as when business is down 40% during the week.
A legal matter that is very easy to solve
The house owners didn't lock the doors before going out, and that's why they got broken in. This is an open and shut case.