Green’s Dictionary of Slang

(US) a lavatory.

1926		‘The Shit House Rag’ in Canfield Coll. Dan! Dan! / The lavatory man, / Has full charge / Of the crapping can.
1935		J. Conroy World to Win 215: This part o’ town stinks like a crappin’ can all the time.
1965–70		in DARE.

a privy or water-closet.

1846		Swell’s Night Guide 50: Go to the pump, and get your a--se sweetened; or else to the crapping cassey, and shoot the lot.
1859		Hotten Dict. of Modern Sl. etc. 26: CRAPPING CASE, a privy, or water-closet.
1864, 1867, 1870		Hotten Sl. Dict. 111: CRAPPING CASE, or ken, the closet of decency.

a privy.

1890–1904

Farmer & Henley Sl. and Its Analogues.

(UK Und.) a privy.

1674		Head Canting Academy (2nd edn) 171: Croppinken A Privy or Bog house.
c.1698		B.E. Dict. Canting Crew n.p.: Croppin-ken, c. a privy, or Bog-house.
1725		New Canting Dict. [as cit. c.1698].
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
1754		Scoundrel’s Dict. 15: A Bog-house – Croping-ken [sic].
1785		Grose Classical Dict. of the Vulgar Tongue n.p.: [...] croppen ken; the necessary house.
1796		Grose Classical Dict. of the Vulgar Tongue [as cit. 1785].
1811		Lex. Balatronicum [as cit. 1785].
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue [as cit. 1785].
1846		Swell’s Night Guide 60: Why, Billy, she wouldn’t be seen in a crapping ken with you. She’s a dodge above a gonniff.
1864, 1867, 1870		see crapping casa