A slush, also known as slushy or slushie, is ice made of different flavors. It is a beverage typically made of flavored ice crystals. Slushies are flavored frozen drinks made with ice crystals from a variety of flavors: strawberry, lemon, grape, etc. Slushies are made with a mixture of sugar, flavor, and water. Slushies can also be referred to as juices.

Source: Slushie Machine Guide