1. A term used for a massively multiplayer online role-playing game that has a battle system similar to the old MUD game "Diku." The first example of this is Everquest, which was accused of directly ripping off the battle code from Diku.

2. Diku was the codebase for the DikuMUD system that many MUDs were based on. Everquest was in a way a graphical interface for the diku battle system, and many of its developers had programmed MUDs.
World of Warcraft is a diku.
The upcoming Star Trek Online is a diku.
Tabula Rasa is not a diku; its battle system requires aiming.
by Moggraider December 17, 2007
Abbreviation of "Do I Know You?" Most commonly used when chatting on a site like myspace or facebook and someone you don't know add's you as a friend or tries to talk to you.
(On Facebook Chat)
Bob: "Hey, how was your day hottie?"
Stephanie: "DIKU?!?!?!"
by JamboBariie October 17, 2010

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