Green’s Dictionary of Slang

chee-chee n.

also chi-chi
[South Indian excl. chi!, fie! or nonsense! or as onomat. representation of the accent. Y&B note, however: ‘there are many well-educated East Indians who are quite free from this mincing accent.’ Ironically, the accent appears to have been that expressly taught at the convents and Christian Brothers’ schools set up in the colonial era to educate the children of such unions. Note Du. lip-lap, the equivalent term for Dutch-Javans]

1. [mid-19C+] a derog. term for a half-caste or Eurasian (the child of an English father and Indian mother); also attrib.

2. [1900s] (W.I.) in ext. use of sense 1, a patois [note che-che n. (2)].