Milkshake/ˈmɪlkʃeɪk/ Definition 1 of 2Pro Tip 1/3Cultural Icon Milkshakes are often associated with American diners and 1950s culture. Milkshakes became popular in the 1950s alongside rock 'n' roll. Pro Tip 2/3Variety of Flavors Milkshakes can come in many flavors, not just chocolate, strawberry, or vanilla. I tried an amazing peanut butter banana milkshake today. Pro Tip 3/3Dessert Status Milkshakes are often considered a treat or dessert rather than a regular drink. After dinner, let's get a milkshake for dessert.