meaning of being that guy

being that guy meaning in Urban Dictionary

usually the one individual you understand that, regardless of how lots of people trust something, whether it is a course of activity or a straightforward reality, ALWAYS disagrees. Ergo title,"Everyone desires to get except THAT GUY". This can be thought to be deliberately or out-of sheer stupidity. After disagreeing anyone will often followup with a statement which completely wrong and false because he "read is someplace" or some one completely unreliable informed him.