BHB Share definition Flag Slang for Black Hearted Bastard. Used commonly to refer to someone who seemingly lacks any emotion. "Garrett didn't even cry during the movie. He has no heart!""No kidding, he is such a BHB." BHB by Bolo! January 7, 2010 0 0 Get merch Get the BHB mug. Buy Now — $32.95 See more merch