http://en.wikipedia.org/wiki/Pajamahadeen

 Pajamahadeen is a word play on Mujahideen. It was coined during the Killian documents controversy during the U.S. presidential election campaign of 2004, in which webloggers were derided by Jonathan Klein, a former CBS News executive vice-president for vigorously challenging the accuracy of a 60 Minutes story by CBS anchor Dan Rather. Klein is reported as saying, "You couldn't have a starker contrast between the multiple layers of check and balances (at CBS), and a guy sitting in his living room in his pajamas writing." Webloggers who were pursuing the story such as Little Green Footballs [1] (http://littlegreenfootballs.com/weblog/?entry=12526)[2] (http://littlegreenfootballs.com/weblog/?entry=12615), Power Line (blog) [3] (http://powerlineblog.com/archives/2004_09.php#007770), and Jim Geraghty at National Review Online [4] (http://www.nationalreview.com/kerry/kerry200409221122.asp)[5] (http://www.nationalreview.com/tks/052840.html) took this insult and turned it into a variety of humorous self-deprecating descriptions of their form of online activism. As Andrew Sullivan noted in response to Klein's remarks: "Actually, I'm in sweatpants and a tanktop. But of course, it doesn't matter a jot what a fact-checker is wearing as long as his facts are correct. CBS's apparently aren't." [6]

Hat Tip to Gavin