A passive aggressive way to get some one to do something or keep them from slacking off at work. The hey bro is most effective when deployed with a hand on the shoulder and proceeded by a modifier like "not to be a pain in the ass" or "sorry my OCD is acting up." Most often used in situations where your friend is also your boss. Can be countered with a "dude, don't fucking hey bro me."
Uhh hey bro, could you please separate out the blue and the green dishes.
Hey bro, do you think you could get to work rather than just sitting around enjoying your coffee.