a walking disaster

Someone who seems to constantly be in or cause great amounts of trouble, difficulty, or mayhem; someone who epitomizes disaster or calamity in their actions or behavior. I heard that John got fired from another job because he kept on messing up his boss's instructions. What a walking disaster! First, I lock myself out of the house, then my grocery bag breaks in the parking lot, and now I stepped on my glasses—I'm just a walking disaster today! Carly's a walking disaster, so don't let her serve any of the food. I don't want the guests to be wearing their dinners.