"Big man" is what you call someone in an insincere or joking manner, and it can apply to literally anyone. Your friends, known nuisances, and even complete strangers.
Man 1: "Hey big man, big man! Can a brotha borrow a couple bucks?"
Man 2: "I've literally never seen you in my life."
OR
Man 1: "Thanks for setting everything straight dude."
Man 2: "Nah, no worries big man!"
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