formerly at Wikipedia:WikiWhacking
Wikiwhacking: Identifying terms or phrases which only appear within the Wikipedia corpus. This can then be used to find mirrors which have captured revisions including the term...
Another completely different meaning (see Wikipedia:WikiRPG) is a game. The object is to start at a given page in wikipedia and attempt to get to another page in wikipedia as fast as possible by only clicking links. For example, start at red herring and attempt to get to calcium. Variants include use or disuse of the back button, and the goal being either to achieve the lowest time spent or the least links clicked.