When men guys acknowledge each other, without speaking or shaking hands, by a simple nod of the head.
"Did you know that guy back there?" "No, I just gave him a gentleman's nod because we made eye contact. It's just polite to acknowledge someone's existence."
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Nod of knowing: a nod between two people who acknowledge each other's existence with a gentle nod of knowing
He gave the nod of knowing and the guy was like, yeah I get it bro.