Jello/ˈdʒeləʊ/ Definition 1 of 2Pro Tip 1/3Common Flavors Jello comes in various fruit flavors, understanding these can help identify the context. Strawberry jello is her favorite. Pro Tip 2/3Served Cold Jello is usually served chilled and it wiggles when moved. The raspberry jello wobbled on the plate. Pro Tip 3/3Casual Dessert Jello is considered a casual or informal dessert often served at family gatherings or picnics. We had jello for dessert at the picnic.