Never used that slang. That "brah" slang came from Hawaiian surf culture. The first time I heard it used commonly was when I went there to surf in the early eighties. Never picked that up, always sounded weird to me. There was other Hawaiian slang I didn't like because the local surfers at the time were not nice people. They didn't like the "howlie" surfers and would take any opportunity to terrorize them. They would say "you like beef?" or "you give me stink eye?" in a hostile tone. I mean back then California surfers could be territorial and you'd just avoid the few places where you might get hassled, but they had nothing on the Hawaiian locals, meanest on the planet. It's weird because the Hawaiians were generally welcoming and nice, but the surfers, forget it. Probably not like that now, but I don't know, haven't surfed there since.