Green’s Dictionary of Slang

(US) a privy, an outside lavatory.

[1929		C. Sale Specialist 6: There’s Chic Sale, Doc Sale’s boy / From Urbana, Illinoy. [Ibid.] 11: You are face to face with the champion privy builder of Sangamon County.].
1943		E. Pyle Here Is Your War (1945) 78: Doctors, nurses, everyone but the patients, washed outdoors in cold water, and went to a Chic Sale with a canvas wall around it.
1958		T. Berger Crazy in Berlin 16: An electric-pencil sketch of a pickaninny sitting in a Chic Sale.
1967		N. Mailer Why Are We in Vietnam? (1970) 12: They used rat paper for tar paper on the Chic Sale.
1970		F. Tarpley Blinky 149: Chick Sales [DARE].
1978		(ref. to 1917–18) H. Berry Make the Kaiser Dance 109: Then he’d casually stroll over to this Chic Sales close to a hundred yards away.
1987		J. Ciardi Good Words 314: Chic Sale [...] An outhouse.
1994		(con. 1930s) E.W. Schodt Leaves From A Farm Boy’s Diary n.p.: In most farm homes in our area, and even in small towns, the toilet was invariably located back of the house [...] It was almost never referred to as a toilet, but rather by such euphemisms as ‘throne,’ ‘Chic Sale,’ ‘outhouse,’ etc.