From Longman Dictionary of Contemporary Englishcamp something up phrasal verbFUNNY camp it up informal to deliberately use unnatural body or face movements, in a way that some people think is typical of a homosexual man → camp→ See Verb table
Examples from the Corpus
camp up• Large hospital camps were set up.• Instead, the government used the block as a corral for an Army camp set up a few blocks away.• Illegal immigrants would be expelled using chartered transport after being housed in camps set up at ports and airports.• He reports that a trip to Catterick Camp to set up rope ladders on the assault course was heavy going.• At this staging camp I picked up some mail.• Nevertheless, we decide to make camp farther up the beach.• In retrospect it now seems that both camps were barking up the wrong tree.• I left the finding of a camping spot up to Chutra as only he knew how to read the countryside. 