1. Noun - An iManiac is a very awesome Runescape player. It means much more outside of Runescape. An iManiac means you are a legit beast who owns everyone at everything. You are so cool and everyone wishes to be you.
Billy: Wow man nice Carl, you're almost at iManiac status with the way you're playing that game.
Carl: Thanks man, I'll never be good as an iManiac though.