A casual term used to refer to people in surprise or when you're lost for words and have nothing to say/ when you're half asleep and it's the only word you can think of. Also used to refer to close friends, in an affectionate way.
Friend: Hey, guess what?
Me: What bruh?
Friend: I pooped the my little pony figure I swallowed yesterday.
Me: -.- Bruh...
Me: What bruh?
Friend: I pooped the my little pony figure I swallowed yesterday.
Me: -.- Bruh...
by Umdon'tknowwords November 29, 2015
Get the Bruhmug. 
by KyBred December 20, 2013
Get the Bruhmug. 
a term used commonly by boys meaning many things like, questioning or doubting or even calling a friend.
bruh, where you come from?
by Johnson2000 January 21, 2018
Get the bruhmug. 