The term 'OOMPA' is a reference to the fictional species of orange-skinned creatures from the 1988 film 'Willy Wonka and the Chocolate Factory'. They are known for their cheerful singing and dancing, and they work in the factory owned by Willy Wonka. The Oompa Loompas are a small, happy-go-lucky people who help Willy Wonka run his chocolate factory. They are loyal and hardworking, and they are often seen singing and dancing throughout the factory.