Diarrhea is runny, watery feces that is often painful, too. People get it from the flu, spicy food, food poisoning, and a host of other nasty reasons.
No one likes diarrhea, but it happens to us all. Not only is your poop watery, but you might have to go often and urgently — you probably know that feeling of running to the nearest toilet, praying you'll make it in time. Diarrhea is a symptom of the flu and other medical problems, but just eating food you're not used to can cause it. If someone can't stop talking, people sometimes use the slang expression diarrhea of the mouth.
