A word used when you don't know what else to say or when someone does or says something very stupid that it makes you cringe. It is also used when you reject someone or when you disapprove them. Like when the word cries and you cry and God cries and people cry and you just gotta say bruh because you dunno what to say about it.
Friend: Shall I includeCoca Cola as your friend?
Other Friend: Bruh, no.
Friend: I know who your other friend's crush is.
Other Friend: Bruh.
Friend: Which is heavier a ton of bricks or a ton of feathers?
Other Friend: A ton of bricks.
Friend: BRUHHHH