The condition tha occurs when eating something so damned spicy that it burns the anal tract. "Spicy in, spicy out". Also these symptoms will arise when eating bad food or ingesting items that have been in the refrigerator for way too long (i.e., leftovers from a restaurant that is now out of business).
Hey, I'm gonna enter that 100 hot wings eating contest. Dude, you are so gonna get lava butt. Yea, but I'll win $100.
I didn't think the Christmas casserole went bad, but I ended up with a real bad case of lava butt.