Term used on the misc for doing something well. Stands for GOOD JOB DAVE MAN, not good job der man or good job dan man. Only morons would think it has any other definition.
Shorthand for: "Good job, door's right there."
Used sarcastically to imply that something very stupid has been done and to guide him/her to leave the room by pointing out where the door is.
Usually used as a mild insult. Also, must be used in the vicinity of a door.