Whoopee/wʊˈpiː/ Definition 1 of 3Pro Tip 1/3Celebratory Spirit Use 'whoopee' to express strong feelings of happiness, especially during celebrations or victories. We passed the exam, whoopee! Pro Tip 2/3Casual Tone 'Whoopee' is informal and best used in casual conversations or festive occasions, not in formal settings. Whoopee! We're having a party tonight! Pro Tip 3/3Audiovisual Context In movies or TV, 'whoopee' might be shouted during carefree scenes, like parties or games. The kids yelled 'whoopee!' as they jumped into the pool.