Blast Radius Share definition Flag Is the level of poo all on the back and inside of the toilet after an explosive bowel movement Dude! I ate 10 white castle's last night and dropped a huge one, the blast radius was a good 12 inches Blast Radius by Ogb18 October 18, 2008 0 0 Get merch Get the Blast Radius mug. Buy Now — $32.95 See more merch