A slang term used to say "bro" or "brother" when referring to a friend or actual sibling. Typically used by dirty white kids, who either surf or skateboard. The word must be said while making some sort of contorted face with one eyebrow raised.
Leif: Yo, brah when are we going to jump off stupid ramps and watch jackass?
Jayden: I dunno brah I'm totally bummed right now. Sorry brah.