A male, ages 18-24, generally of the Caucasian descent, who refers to their acquaintances as "Dude" and/or "Bro" in the same sentence. In this case, the male uses both terms in one sentence. The conversation begins with "Dude" and ends with "Bro", 9 times out of 10.
A dudebro is a mix of a surfer bro, frat dude, and sk8r boy but has no knowledge of any of these things. The only time that dudebros occur naturally is lack of confidence, and desperation to fit in. Common dudebro names include but are not limited to: Chad, Cooper, Dylan, or Ryan. Dudebros may also have a form of communication, commonly seen as a serious of hand motions resembling the "hang loose" or "rock on" signs.
Being referred to as a dudebro is almost never positive.
"Is he trying to wax his skateboard? What a dudebro."
"Yeah I was just playing some beach volleyball with a bunch of dudebro types, you know what I'm talking about"
A buddy that is much more than just a dude, or a friend. Used when emphasis is needed to express camaraderie , deep friendship or admiration in a manly sort of way.