
Have you ever been to Hawaii? There are buses at the Honolulu airport that will take you between terminals called Wiki-wiki buses. They are the fastest way to get from one terminal to the next. Wiki means "fast" in Hawaiian. What does that have to do with Internet wikis? Well, everything! Ward Cunningham is the creator of the software that allows users to edit content on the Web...quickly. Wikipedia.org is one of the most famous websites that uses Mr. Cunningham's technology. Mr. Cunningham named his technology "WikiWikiWeb" after the Wiki-wiki buses in Hawaii as opposed to calling his technology "quick-web." He figured WikiWikiWeb is more fun to say than quick-web. His technology allows anyone to quickly and efficiently create content on the Internet...get it?
source: http://c2.com/doc/etymology.html