An "outhouse" is a small building or structure that is placed outside, usually behind a main house, and it contains a toilet or a place to go to the bathroom. Full definition
The backgrounds contain fun little games, like tents that act as outhouses for men, women, and genies. (hardcoregaming101.net)
Our lodge has evolved from an extremely rustic Jungle River Camp with outhouses and river bathing to feature a stunning collection of 5 star luxury Treehouses which are complete with rooftop decks and hot tubs to relax under the stars above. (cavesbranch.com)