The word "poop" is a colloquial term used to refer to solid waste that is excreted from the body, commonly known as feces or stool. It is a natural part of the digestive process where the body eliminates substances that are no longer needed after nourishment has been extracted from food.
The word "poop" is derived from the late 19th century in North American English, likely a reduplication of the earlier term "poup," which comes from the French word "poupée," meaning "doll" or "little child." The informal, childish sense reflects the more playful way of referring to bodily functions.