granny bj Share definition Flag When a girl's about to give you a bj and you knock out her teeth with a nice punch. So, then she can perform a granny bj. Teeth free. Angel knocked out Angelas teeth so she wouldnt bite while giving him a granny bj. granny bj by Porp September 2, 2007 0 0 Get merch Get the granny bj mug. Buy Now — $32.95 See more merch