A type of WikiBot used by spammers to post WikiSpam automatically.
Suspect such a bot is responsible if you notice many pages in succession edited from an unusual or Chinese ip address (eg., starting with 61, 218 or 221), and add a report to WikiSpammers if spamming is confirmed.
See WikiSpamSolutions for ways to deal with this problem.
http://googleblog.blogspot.com/2005/01/preventing-comment-spam.html for Google's new implementation to devalue this kind of spam.