Hindoo, n. — Green’s Dictionary of Slang

Hindoo n.

also Hindu

[facet. uses of SE Hindoo/Hindu, a follower of Hinduism and thus, broadly, an Indian]

1. (US) a person with special ability, a wizard.

1908		B. Fisher A. Mutt in Blackbeard Compilation (1977) 27: You’re a Hindoo with that gat, Pa.
1916		T.A. Dorgan in Zwilling TAD Lex. (1993) 109: Down in Kentucky they say he’s a hindoo at pinochle.

2. a spell.

1951

Cusack & James Come in Spinner (1960) 46: Seems like there’s an ’indoo on that ’orse. Never ’as ’ad any luck.