"heat bro" is a slang term used for great friends. Calling someone your heat bro basically means they're your best friend through thick and thin.
Greg: "What's up, heat bro?"
Alex: "Nothin' much. You?"
by Perpetual3 September 19, 2023
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Matthew: Yo dis kid last night tried to jump me.
Andrew: Ya heated Bro?
by Kartilic February 4, 2010
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