Oatmeal milk instead of cow's milk. Fruity White for Oat Milk means to make Fruity White coffee with oat milk instead of the original milk. Fruity White is a type of coffee that is made with an espresso base, milk and milk froth to give it a white appearance, and a layer of coffee oil is added on top of the milk froth to make it. Oatmeal milk is a milky liquid formed by processing oatmeal and water as ingredients.