Red Wall

The act of mass-mentioning a single user in twitch chat, so the text highlighting turns their chat red.

person A: hey, have we showed Mike our appreciation today?
person B: yeah, we totally red wall'd his chat earlier with well wishes

Red Wall

The act of mass-mentioning someone in twitch chat, so their chat lights up in red because of the colour highlighting of chat messages containing one's username.

User1: Hey @Mike
User2: What are you doing @Mike
User3: Stop being such a lazy streamer @Mike
Mike: Stop Red Walling me!