Rising to a level of popularity so great that you no longer need to mention the URL anymore.
For example: When a magazine, news article, or conversation can just mention a site like "Funny or Die" without having to add ".com" at the end, and most everyone seeing the reference will know that they're talking about the website. Funny or Die has become deurled because everyone knows that it's a website.
As John and I were talking about a disagreement he was having with his girlfriend, he said to me, "Yeah, I had completely debungled her argument, by that point."