"Belly flopper" is a term that refers to a person who jumps or dives into water with their belly hitting the surface first, causing a loud splash and often painful impact. Some synonyms for this term include "belly-buster," "belly-whacker," "tummy smacker," and "belly-flop." These terms all describe the same action, but may be used in different regions or by different groups of people. Other variations include "stomach slam," "abdominal assault," and "navel dive." Regardless of the term used, the act of belly flopping is typically frowned upon as it can be dangerous and cause injury.