To those who got touched camping. This sounds like one of those things people try out on dorky forums before applying it to some lowly street credibility, while mom still pays for the groceries.
You don't read much do you? In life or at least just the rest of this thread. It's probably currently more popular in England, but it's evolved over a century in British, French, and American media. Unless you mean those dorky forums that existed during the Great Depression?
I reiterate, I get people having their head under a rock, but don't smash the rock so hard onto your own head that you make yourself retarded
*edit*
Monty Python is a well known british sketch-comedy group, mostly remembered for the Holy Grail film. Their first film in 1971 was "And Now For Something Completely Different," which was basically a lot of new or recycled skits from their tv show which started in 1969, fashioned together with different cuts and segues. This one bit was here in the movie and originally from the show earlier, where you see a military troop being told to "Camp it up," and they use the play on words to basically turn the drill into much more flamboyant theatrics
This bit isn't really great as a stand-alone, there's a running gag through the film, especially with that commanding officer. But this video here is a mainstream comedy group in a feature film from nearly 50 years ago using the phrase you've never heard, so obviously they're 'kids using it today as slang on the internet,' when all you needed to do was google "slang camp" for 10 seconds. Normal people either look up things they don't know, or just don't care about not knowing them. No need to be a bit of a dick about it.
Maybe you should get a smaller rock