A phrase (coined by Rory Donohoe) used as an alternative to the word "yes". Usually spoken in a joyful tone.

heck yeah dude is a term used when something really cool usually to your benefit happens

An affirmative exclamation professed by ecstatic females (or males) during sexual intercourse at the point of orgasm.
It is also a lifestyle brand started in the year 9 a.d.
(see fuckyeahdude.org)

The response to when someone is telling an interesting story or stating a fact that you dont care about.

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 ;)"