I'm a white girl and I say breh.. it's a more laid back, less douchey "bro", although I am totally aware that being a female and saying that to begin with is pretty lame, but whatever.
I was unaware that it was slang constricted to a certain race, or not acceptable for white people to use it, to be honest..
I was unaware that it was slang constricted to a certain race, or not acceptable for white people to use it, to be honest..