What does "feet wet" and "feet dry" signify in aviation terminology?

The phrase "feet wet" refers to an aircraft flying over water, while "feet dry" indicates it is flying over land. These terms are commonly used by pilots and air traffic controllers to quickly and effectively communicate the aircraft's geographical position relative to coastal boundaries or inland territories. Understanding these terms is crucial for operations that may be sensitive to the type of surface below, such as in mission planning for search and rescue, military operations, or fuel management. The distinction helps in assessing the possible risks or operational requirements associated with flying over different environments.