wilyHi

What the picture shows

A black cartoon cat with pink inner ears, a green headband with trailing ends, closed smiling eyes, white whiskers, and one paw raised in a fist, outlined in bright yellow. Chatters likely use it as a cheerful greeting or to signal an energetic hello when joining a stream.

No measured meaning yet. Used 46 times in 2 channels this month; one is written once chat gives enough evidence.