Google Bomb

Also known as Link Bombing, but known as Google Bombing specifically when targeted to Google. In practice targeting one search engine would affect others.

A Google Bomb takes advantage of Google's ranking algorithm, generally for amusment, to cause a webpage to appear unexpectedly for a certain search phrase.

The most well known Google Bomb is probably the 'George Bush, miserable failure' bomb, where a search on Google for 'miserable failure' returned George Bush's presendential autobiography as the first result.