Combination of the words negro and bro. By replacing the "gro" with "bro" you remove all doubts about the racism so you can say the word without the fear of offending someone and in the end feeling better about yourself.
As an adjective - Jared is the best nebro ever he is always willing to go out of his way to do stuff for me.
i dont know dude, do you happen to have a firearm on you?
Synonyms: Wigga, wanksta, wankster, cracker, craka, whiteboy, Obbi, Eminem
Ey yo punk, you ain't nuthin but a nebro. get off my block befo i busta cap in yo bitchass.