“jphYADUN” is an emote that can be found on:
| jphYADUN | |
|---|---|
| |
| Available On |
|
| Based On | Ya Dun |
| Attribution | |
| Artwork | by  Highlaw |
It is a reference to Ya Dun.
It was drawn by Highlaw.
Chat typically spams this at the end of each stream, because the stream is "dun".