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1.
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?"
by Cal and Matt December 07, 2004