Choad Wart
It's similar to a Cocknozzle. It's what you call somebody who acts like a "know it all", and in most cases, is wrong more often than not.
Guy 1 - Hey, did you guys hear that earthquake in China was a 7.9 on the Richter scale?

Guy 2 - It was actually a 9.5.

Guy 1 - Shut the fuck up you Choad Wart, I heard on CNN it was a 7.9.