It’s not what you think. It’s a link back to this post through a “shady url” service. Instead of shortening, it makes the URL look “shady and frightening.”
I made a URL shortener a while back while I was working In Research & Development at OrangeSoda. It does the same thing as other URL shorteners, only it uses the underscore and hyphen alongside alphanumeric characters in the short URL, and the url is case sensitive (oran.gs/a is different from oran.gs/A). It is complete with bookmarklet (screenshot) and statistics. You should check it out. It’s pretty cool.