What is Chinese Secret?
1.
A "friends with benefits" relationship. Usually a Chinese secret involves a relationship between two individuals that contrasts sharply. For example, a relationship between a African American male and a Caucasian female, or a medical student and a janitor, or two individuals with statistically significant age difference.
Yo, did you see Alonzo trying to holler at that girl? He wants her to be his Chinese secret!
See