Definition & Meaning of "chi-chi"in English

What is the origin of the term "chi-chi" and how is it used?

Chi-chi is a slang term that appeared in early–mid 20th-century English to refer to the breasts of a person. The word likely comes from baby talk or playful reduplication, mimicking soft or cutesy sounds used to describe body parts. Historically, it was mostly informal and playful, not strongly derogatory, though it could carry a mildly sexualized tone depending on context. Today it is generally understood as colloquial and somewhat quaint, and is not considered highly offensive, though it is casual and not used in formal speech.