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A person you know from your town or hood, or someone in your crew or family. Basically someone you can trust to not stab you in the back or steal your lunch money.
My nagosie told me the principal was going to give me a detention. Turns out he was right.
My nagosie borrowed my bike and never gave it back. I still haven't forgiven him.
My nagosie is the only one who knows my secret about liking glitter.