Roughly translates to "YOU ARE WRONG AND I AM RIGHT", although it can be used in many different contexts.
Perry: Top hat guy is waaay better than Bowler hat man!
Norman: NU-UH!
Perry: Damn! You win this arguement!
Norman: NU-UH!
Perry: Damn! You win this arguement!
by Norm' June 4, 2011
Get the Nu-uhmug.