gnarbastard Share definition Flag grunge skater who doesn't give a fuck about anything but skating. not afraid to do anything. stylish skater. that mothafucka hit that 12 rail like it ain't shit, he a gnarbastard. gnarbastard by kris lackey August 11, 2007 0 0 Get merch Get the gnarbastard mug. Buy Now — $32.95 See more merch