From the Muppet character, the Swedish Chef. A phrase used to indicate that someone has just said something which sounds like it should make sense, but doesn't at all.
Person 1: I really enjoyed that movie.
Person 2: Yes, the acting was superb.
Person 3: All I can think about now is gourmet cheese.
Person 1: Bork bork!
Person 2: Bork bork!