The term 'Arabian Stopper' refers to a type of horse that is known for its agility and speed. It is a breed of horse that originated in the Middle East and is used for racing, show jumping, and other equestrian sports. The term 'WHOA' is an acronym for 'Walk, Halt, and WHOA, ' which are commands used to control a horse's movement. This term is often used to describe the Arabian Stopper's ability to quickly stop and turn on command.