Nagbro Share definition Flag That bro that always bitches and whines about shit, like a nagger. John always freaks out when he loses, then always whines when we don't play, I'm tired of him being a such a Nagbro. Nagbro by FlatulentMan12348 November 8, 2010 0 0 Get merch Get the Nagbro mug. Buy Now — $32.95 See more merch