Duder is a word of many possibilites. It can be used as a replacement for dude. It can also be used to mean someone is more dude-like than someone else (as in dude,
duder,
dudest.) It has also been known to be used to describe objects for which the name has been temporarily forgotten, or otherwise unknown to the user of the word. Still yet another usage is a verb which means the act of being a dude or doing
dudely things.