Okay so everyone is talking about with Hawaiian slang or jerks that are too lazy to even say bro, but NO. They are all wrong. This is just part of the Hamilton Musicals vocabulary, and should only be used in that context.
âBRAAH BRAAH I AM HURCULES MULLIGANâ
âTheyâre battering down the battery check the damages- BRAAHâ ((examples from âRight hand manâ and âAaron burr, sirâ))