Hong Kong Code-mixing Dictionary

Definition: A romanised code-mixing term used by westernised Hong Kongers to refer to 'secondary two syndrome' in Cantonese, which is someone in their second year of high school and acting childish, as if they are living in their own world. The term was first popularised by the comedian Hikaru Ijuin in a Japanese radio show in 1999.

Usage: E.g. My older brother has jung yi beng – he thinks he is a hero who can save the world.

Synonym: 中二病

Reference: https://www.youngpostclub.com/yp/discover/lifestyle/article/3147729/sup-sup-sui-start-new-school-year-these-cantonese-slang