So basically, like we talked about before, the term "happy camper" is used to turn something negative (it could also be something annoying you) into a funny situation!
Here's some examples of how it is said:
• "Wow, that guy is not a happy camper"
• "Looks like someone is not a happy camper."
I'll even wrote a story if that might help 😁
You and your friend are sitting and playing a game, but you are annoyed because a dog in the neighborhood is barking really loudly, so you turn your friend and say "Dang, that dog is NOT a happy camper" 😑