A combination of bro and Boba Fett.
It is used when a guy is referring to another one of his guy friends (one of his bros). It can be used at almost any time. It does not have to be used when talking about things having to do with Star Wars, although it will be better understood if your bros are familiar with Star Wars.
guy1: Hey bro, wanna hang out later at my place with all the bros?
The combination between a hill billy and a bro. The typical guy who enjoys cage fighting, energy drinks, and hard rock. However on the other side of the coin they like their big lifted truck, cowboy boots, and the rodeo. These types of men are generally heavy drinkers of light beer and think that they are gods gift to women. The blend often happens somewhere between Garth Brooks and Motle Crue.
Hey dude, check out that guy. I bet he can't wait to get to the bar and watch hardcore cage cuddling, chug a pitcher of cheap beer and make fun of his girlfriend. What a brobilly.