Green’s Dictionary of Slang

crump-backed adj.

hump-backed.

1654		Mercurius Fumigosus 3 14-21 June 4: She was Beetle-brow'd, Monkey-proud, Leathern-Ear'd, Hawkes-nos'd, Wry-mouth'd, Crump-backt, Hopper-arst, Splay-footed.
c.1698		B.E. Dict. Canting Crew.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.