Like bro/brah which stem from brother, bru or broo comes from the word "brood" meaning a family of offspring or young (or brothers).
A South African originated word.
An alternate way of saying bruh, but they just don't care as much when about what you're saying. Then all the sudden they try and play it off like it was a mistake but they know damn well they meant to spell it like that way.
An even more bruhing version of the word bruh. A response for something so bruh-worthy that it doesn't even deserve to get responded to with the entire word.