When you have some news to share or referring to something or if you are surprised. It can also be if you find something really funny .
by Ratttt September 13, 2018
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Broooo is either just a long spelt bro or if a sister says it to her brother that means they/she wants to do some fun thing in bed together
savannah-“hey broooo

Parker-“not now sweet cheeks my friends are over”
by Virrus May 26, 2020
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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.
Bro1: "Bro, were you just singing the same song as me?"

Bro2: "Yeah bro..."

Bro1 and Bro2 in sync: "broooo"
by Braap46 November 29, 2015
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What broooo is a gay slang, only queers say this!
“What broooo? Wanna go tonight? ;)
by jay bruh November 12, 2020
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