A marvelously useful syllable that indicates that the statement immediately preceding is blatantly obvious, or that the preceding question has a blatantly obvious answer.
'Will Connecticut Republicans nominate for the Senate a former congressman with a reputation for bipartisanship, or a businesswoman whose claim to fame is building a professional wrestling empire? Duh."
by Jan423 August 09, 2012
A phrase used when something of great ecxellence is hapening. Usually followed by pointing one finger to the ground and rotating it.
Two guys walk into a bar. A hot chick goes up to one of the guys and asks if he wants head. He would look at his friend, say duh and spin his twirling towards the ground.
by Big Chew June 23, 2005