A person who is annoying fan of aspecific individual, usually a celebrity of some sort. They often believe that the person can do no wrong and is the best at what they do when there is obviously others who are better.
Person A: "Q-bert is the dopest DJ in the world"
Person B: "Sorry to crush your sack surfing wave, but he's a one trick pony."
CnB is actually a character thought up on the bus my friend and I in 8th grade. His Body is two balls (for his feet) and the shaft and head make up the rest. He is often smiling, and always flipping the bird.
Damn...Mr.CnB would kick pikachu's ass.