Green’s Dictionary of Slang

qui-hi n.

also qui-hai, qui-hy
[Urdu koi hai, is anyone there?, the usual summons to a servant; note E.F. Benson’s character, the ex-Indian Army Major Flint, in the Lucia stories, whose catchphrase this is]

[mid–late 19C] (Anglo-Ind.) an English resident of Calcutta; cite 1855 suggests any former Anglo-Indian, not specifically living in Calcutta.