When confronted with something totally awesome, a Woah-Bro will exclaim, "Woaaaaaaahhhhh brooooo".
This is the male equivalent of the "Woo-Girl".
A Woah-Bro may also be a "Dude-Bra" depending on his level of douchebaggery.
Dude 1: Did you see that girl's booty?
Dude 2: Woaaaaaaahhhhh brooooo!
Dude 1: I picked up this sick bro-tank today, take a look.
Dude 2: Woaaaaaaahhhhh brooooo!
A strung out bro is when two guys do the exact same thing at the exact same time so the two guys will whisper "broooo" after the epic moment the two guys just experienced.