an 18-24 year old american male, generally Caucasian, who wears birkenstock sandals along with polos (sometimes pink) that have their collars "popped", watches Family Guy, plays ultimate frisby, and wears an upside-down visor or a baseball cap with a pre-frayed brim.
Dude Bros are also known to listen to music such as Dave Matthews, Jack Johnson, Incubus, and crappy rap artists that are played constantly on the radio. Some dude bros enjoy playing Gamecube due to the fact that they become mesmerized that they can play games on a cube while drinking beer.
Dude bro's are incredibly insecure in their manhood, which makes them: insanely jealous of their girl friends, overly macho, and laughably homophobic.
dude bro 1: "hey dude! wanna go chill?"
dude bro 2: "sup bro? sure, we can play gamecube..."
another example would be the guy who wrote the definition for wakeboarder