Refers to a conservative website or agency which has an official or technical-sounding name, but turns out to contain biased information.
The website will generally not advocate researching the topic for oneself, and contain many references to "liberals," "the liberal agenda," "liberal bias," and the like.
The articles on the website will usually speak against Democrats, progressive reformers and grassroots activists.
"Did you hear about that guy from the Media Research Center on Glenn Beck's show the other day?"
"Yeah, I looked him up--turns out his agency is another anti-think tank."