Money Sonic’s newest slush is a Strawberry Snowball Slush Float. You can try it early on the app. May 22, 2023 Mike Snider, USA TODAY Comments Off on Sonic’s newest slush is a Strawberry Snowball Slush Float. You can try it early on the app. Sonic Drive-In is adding a new limited-time drink to its menu: the Strawberry Snowball Slush Float with strawberries, ice cream and sugar sprinkles.