noun, masculine/ka.ka.twaʁ/plural: cacatoirs
outhouse (toilet); bathroom, restroom, lavatory
“Il est constipé. Il a passé une heure dans le cacatoir.” — He’s constipated. He's spent an hour in the bathroom.
From caca (“poop”) + -t- (euphonic interfix) + -oir (suffix denoting a place where something is done). That is to say, literally, “a place where one poops”.