“Camp” is derived from the French slang term camper, which means “to pose in an exaggerated fashion.” It may ultimately derive from the Latin root "campus" meaning "field/farm/country", thereby suggesting some connection to a stereotyped behavior attributed to rural folks, akin to "provincial". The OED gives 1909 as the first citation of "camp" in print, with the sense of "ostentatious, exaggerated, affected, theatrical; effeminate or homosexual; pertaining to or characteristic of homosexuals. So as n., ‘camp’ behaviour, mannerisms, etc. (see quot. 1909); a man exhibiting such behaviour." According to the OED, this sense of the word is "etymologically obscure."