663 (liù liù sān) — Used to denote being 'cool' ...
This slang is used to denote being 'cool' or 'awesome'. It sounds like the Chinese words for 'smooth' and is often used to compliment someone's style.
Example Usage
你的新发型真663！
Your new hairstyle is really cool!
Cultural Context
The term is often used in the context of fashion and personal style within youth culture.
Category: internet-culture