The new and improved version of the common slang term “Hell yeah.” Used to express excitement, approval, appreciation, or affirmation of something heard or seen.
John: Bro, I was hanging out with Samantha last night, and she gave me the best head of my life.
Dan: Oh, fr, bro?
John: Heol yeah, fr, bro!
Dan: Heol yeah, bro! Nice!
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 ;)"