If you don’t know what “Google Bombing” is, it’s a way to raise a site’s ranking on Google. From Wikipedia: “Because of the way that Google’s algorithm works, a page will be ranked higher if the sites that link to that page use consistent anchor text. A Google bomb is created if a large number of sites link to the page in this manner.”
Colbert has, in the past, pranked Wikipedia by asking viewers to go to the site and edit their article on elephants. Because of what he called, wikiality, this would result in a rebound in elephant population. 
Now, he’s asked his viewers to help him rank first on Google for a … ahem, certain phrase.
Earlier this week, Colbert announced on his late-night show, The Colbert Report, that he wanted to rank first on Google’s search results for the phrase “giant brass balls.” (A tad lewd, yes.) Colbert-idolizing bloggers, however, thought that just wasn’t good enough, and decided to try to put him at the top of Google’s hierarchy for the phrase “Greatest Living American.” Source: News.com
As of this writing, he’s still first for “Greatest Living American”. I’m sure you’re aware of the most famous Google bomb, the one where typing in “miserable failure” would link to George W. Bush’s presidential biography.
April 20, 2007 at 12:23 pm
Hello, we are one of the sites supporting the campaign to prove Stephen Colbert is in fact the greatest living american. We did this by painting one of our clawfoot tubs with the “red, white, and blue” to honor Mr. Colbert. We thought you might find this amusing. http://www.vintagetub.com/greatest-living-american.html Thanks for you time, Dan and Vintage Tub & Bath