A "bro" who works as a pharmacist and predicts the future quite often.
"...damn brostradamus, how'd you know I'd get in the car crash?"
"I don't know. Have some vicodin."
A bro of such incredible wisdom that he can see into the future.
Jeremy: Dude, Arthur told me that this chick was gonna ask me out and she totally did it!
Brent: Yeah, he's a real brostradamus.