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1 definition by Jesse Guiles

 
1.
(N) A corruption of the common epithet dude. It is synonymous with dude, but exponentially more lame -- unless used ironically.

The term first appeared (to my knowledge) on the television adaptation of horror author Stephen King's Quicksilver Highway. A hitchhiking drifter addressed his driver as 'dudemar' inspiring rage in the latter. This is the common response.
Hey, dudemar, chill.

or

What's happenin' dudemar?
by Jesse Guiles August 18, 2006