Former MSNBC anchor Keith Olbermann posted a "worst persons" video segment on his blog Thursday night, in which he gave Donald Trump the top prize for pushing the "birther" conspiracies and asked the presidential hopeful to "FOK off."

Olbermann's website is called the "FOK News Channel" -- short for "Friends of Keith," but also a play on the Fox News Channel he loves to slam.

Watch the video, via FOK News.