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2.
(n.) the male love interest of a strong female protagonist, typically little more than eye candy. He possesses little personality or depth of character.
(n.) the male version of a damsel in distress.
(n.) an attractive male with little brain power or practical skills. Typically seen as belonging to a socially mobile female.
ie. Michael Corvin in 2003's Underworld is Selene's dudemar.

ie. "Who is Kate's new dudemar? He's a total hottie."
by Thomas L. Cunningham December 07, 2006
 
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
 
3.
(n.) the male love interest of a strong female protagonist, typically little more than eye candy. He possesses little personality or depth of character.
(n.) a damsel in distress who is male.
ie. Michael Corvin in 2003's Underworld is Selene's dudemar.

ie. "Who is Kate's new dudemar? He's a total hottie."
by Thomas L. Cunningham December 03, 2006