Douglas Harper's Etymology Dictionary
also chichi, "extremely chic, sophisticated," also "pretentious fussiness," 1908, from French chichi "airs, fuss." Perhaps, like frou-frou, imitative.
Wikipedia
Chi-Chi or variations thereof may refer to:
Usage examples of "chi-chi".
But even here in this crescent of chi-chi shops the cyclists were up to their dirty tricks.
Back in Kyohvic—“Misty Harbor,” as the helpful stab-in-the-dark translation says in squiggly italics on the sky-port sign, dittoed below in the barred neon of chi-chi Ogham—Matt Cairns shoulders his duffel bag and heads through the concourse for the shuttle train to town.
But she must finish her dessert, too - like all chi-chis she had a passion for sugary confections - so she brought it to bed, if you please, and gorged herself on eclairs and cream slices while I fondled her, well content to play restfully for a change.
Cold winter melon soup, gosling salad with raspberry vinegar, a nice sweetbread and truffles teaser, pike and crayfish quenelles, blackened chicken with ze leetle tiny pink peppercorns, the always chi-chi pasta pesto, of course, and to top it off, lightly baked goat cheese and a daring cucumber-pineapple sorbet.