A person who uses the term "dude" and "brah" therefore becomes labeled a "dude brah".
A skater/surfer etc. who addresses themselves as "dudes" and "brahs".
"I was sitting in Del Taco the other day, and these dude brahs came in so I had to challenge them to a dude brah contest but I was outnumbered."
"No way! You lost a dude brah contest?! What is happening to this world?"