Durrr...
When one person, while engaging in a conversation with someone, and that someone says something silly or stupid--the other person responds with "Durr...." Similar to using the word "duh."
Cooper: ...yeah, David Carradine was so creepy. I met him once while shooting Kung Fu: The Legend Continues.
Kelly: He's dead now, right? (Pause)
Kelly: I know I'm a guy, but I'm a modern guy who can admit that David Carradine was one, good looking guy--damn, dude! I never miss an episode of The Partridge Family...he kinda looks like a chick!
Cooper: That was David Cassidy! Not David Carradine.
Kelly: Ohhhhh.
Cooper: Durrr...