Chicago Poop Rocket Share definition Flag The act of combining Diet Coke and Mentos in your asshole, while constapated. Brandon: I'm soooo Backed up. Will: That's okay, I'll give you a Chicago Poop Rocket!!! Chicago Poop Rocket by XxXDeathPandaXx November 29, 2010 0 0 Get merch Get the Chicago Poop Rocket mug. Buy Now — $32.95 See more merch