paint chat; online drawing chat room
An Internet chat room where users can draw pictures together in real time, often with a shared canvas.
I used to play with friends on a paint chat a lot.
Compound of お絵かき (o-ekaki, 'drawing', from 絵 (e, 'picture') + かき (kaki, 'drawing', noun form of 書く (kaku, 'to draw'))) + チャット (chatto, 'chat'). A straightforward modern coinage for a specific type of online service.