An all-purpose interjection. Similar to "Dude!" at the beginning of a sentence. Used to introduce a sentence. Can be used in any and all situations depending on voice tone and inflection. Can also be used as a greeting. NOT a person.
-"Dude, my mom died!"
-(with sad inflection) "Broh, brah..."
"Dude, I won the lottery!!!"
-(with excited inflection) "Broh, brah!"
"Broh, brah! How goes it?"