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1.
A phrase often used to describe one's intense agreement, acknowledgement, or pleasure. Used in stead of saying "Yes", "I agree", "Awesome", "Great", or any number of positive-sounding adjectives.

Popular amongst verbal slackers and stoners in Northern Michigan who also say "Hey, Man" and "No worries" a lot.
Guy 1: Did you buy any snack cakes?
Guy 2: Yeah Bud! I totally got the munchies, man.

or

Guy 1: I just won the lottery!
Guy 2: Yeah Bud!

or

Guy 1: Did you return my bottles?
Guy 2: Yeah bud.
Guy 1: You suck. I was going to use that to put gas in my car.
by TheeJenniBurger October 30, 2009