Technically, a "Googlebomb" (sometimes called a "linkbomb" since they're not specific to Google) refers to a prank where people attempt to cause someone else's site to rank for an obscure or meaningless query. Googlebombs very rarely happen for common queries, because the lack of any relevant results for that phrase is part of why a Googlebomb can work. One of the earliest Googlebombs was for the phrase "talentless hack," for example.
Googlebomb Story:
December 2003
If you do a Google search on the word [failure] or the phrase [miserable failure], the top result is currently the White House’s official biographical page for President Bush. Everyone links to http://www.whitehouse.gov/president/gwbbio.html with the words "Miserable Failure" is to make Shrubya the top google pick.
