Google Bombing (also known as Google Bomb or Googlebomb) is the intentional manipulation of search engine results by individuals or groups to produce unexpected or humorous outcomes. It works by creating a large number of backlinks, typically using exact-match anchor text, to a particular webpage which makes it rank high for a specific, often unrelated query.
The first major Google bomb was observed in 1999 when a search for “more evil than Satan himself” showed the Microsoft homepage as the top result on the SERP.
One of the most famous examples of Google Bombing dates back to 2003 when a search for the phrase “miserable failure” led to the biography of then-US President George W. Bush on the White House website. This prank was carried out by linking the phrase to the webpage from numerous blogs and forums.
In response to these and other instances of Google Bombing, Google has continuously updated its algorithms to minimize the impact of such tactics. In 2007, the company released the “Google Bomb Fix,” which aimed to minimize such manipulations, and there have been no significant Google bombs recently.
Google bombing demonstrates the importance of anchor texts for SEO. It is confirmed that Google still uses anchor texts to understand the content on the linked pages and to associate pages with search queries.
https://twitter.com/JohnMu/status/864190235822899200
This means that the anchor texts of the links pointing to your website must be relevant. Also, they should not be keyword-stuffed, as this can be detected by Google as over-optimization.