The mind state of a serious bro. You have got to be thinking about the swell, hanging out with top mints, longboarding, greeting others with "sup bro?", noticing your best bro's tan, and find yourself most attractive with your shirt off.
We were boarding down Hall when all of a sudden SC's sector9 split and he started freaking out. I told him to bring back the sup-bro mentality and things went back to being chill.
The SupBud expression is only for the ones who know what's up! Some say its robotic and it is what it is. Basically for the average assclown it's basically saying Hi how's it going?
SupBud!!! How's it going? Would you like to go out for some sex and pizza?