Neber is a swedish slang equivalent to the slang nibba. It originates from the swedish word neger, which would translate to nigger or nigga. It basicly is used the exact same way as the english word nibba
White folk: What up NEBER?!
Black folk: Did you just say neger?!
White folk: No, lol, I said "NEBER"!
Black folk: OK, we cool, my NEBER.