"Fluff", when it comes to desserts, is more about a texture than about a specific recipe. That is, 'fluff' is what people often refer to as a 'fluffy or airy' looking texture on a dessert that is often caused by whipping the ingredients to add the air. A fluff dessert can sometimes be: Marshmallow cream based. Whipped topping based. Or a combination of marshmallow and whipped topping.