A dude that works out for girls, fag accesories, brags about special size, styled hair, sports, yells "skate or die" at skateboarders, etc. etc.

YDBH-Yo Dude Bro Hella

When any of the four words can be said,you must say them all.

Someone who is insensitive, arrogant, dumb, annoying, etc. It is pretty much a nicer word for douchebag

Dude Bro Yeah is a "code phrase" for a combination of any two girls that you like, or think is very attractive. For example "Dude" being the face, and "Bro" being the body. and "yeah" just meaning "damn son ;)"

It's a phrase similar to calling someone a dude. But this is way cooler.