IRC / chatroom
popularised ~1990-2005 · 0 terms catalogued
Before Discord and Slack, there was IRC. AFK, lurking, op (channel operator), n00b, 1337, pwned and dozens more entered general English from IRC channels and early MMO chats. The ancestor of every modern chat-room subculture.
We don't have any IRC / chatroom-origin slang catalogued yet.