An alias for oneself. A code name if you will...
First thought up on Everquest, the name was given a paladin.
Now used on virtually every internet forum and game.
i.e. Everquest, DAoC, World of Warcraft, Anarchy Online, and many more.
The word Ratara, can be substituted for a female character.
Many will simply call him Rat for short.
"Hey Rataru, wanna group?
"Man that Rataru sure is the OWN"