Frappe/fræˈpeɪ/ Definition 1 of 4Pro Tip 1/3Casual Treat Frappe is usually a casual dessert drink, not a formal beverage. Let's get a frappe after the movie! Pro Tip 2/3Variety of Flavors Frappe flavors are often inspired by ice cream varieties. I can't decide between a mint or strawberry frappe. Pro Tip 3/3Diner Classic Frappe is a staple in American diners and ice cream shops. This diner is known for its homemade frappes.