"Yuck" is an expression used to convey disgust or distaste. People often say "yuck" when they encounter something unpleasant, such as spoiled food or a messy situation. It serves as a quick way to communicate that something is not enjoyable or is off-putting. The term can also be used in various contexts, such as when tasting a food that is unappetizing or when witnessing something that is considered gross. In children's language, "yuck" is commonly used to express their feelings about certain foods, like vegetables, or activities, like cleaning up after a pet, making it a relatable term for many.