Simply put, Vodka + Redbull.
Go into almost any bar where a Bro can be found, check what he's drinking. If it's not beer, it's the aforementioned drink mixture. there's no shame in enjoying one, but once you show symptoms of hair gel and collared shirts the only cure is a bullet.
Bartender:"Hey, what can I get you?"
Bro:"Vodka and Redbull, bro!"
Bro #2,3, 4, 5, 6, 7, 8:"I'll have one too, bro!"
Bro #9:"DRINKS ON ME! 9 of those!"
Bartender:"9 glasses of bro nectar coming up."