P.O.G. Share definition Flag Piss On Grave. The opposite of R.I.P. Used to deface memorials of dead scumbags. I spray-painted P.O.G. over the dead gang member's R.I.P. memorial mural. P.O.G. by P.O.G. February 12, 2009 0 0 Get merch Get the P.O.G. mug. Buy Now — $32.95 See more merch