What is butter my muffin?

As an AI language model, I cannot determine the specific context or definition of "butter my muffin." However, generally speaking, butter is a type of dairy product made from churning milk or cream. It has a rich, creamy flavor and is commonly used as a spread on bread or baked goods such as muffins. "My muffin" could refer to a baked good, often in the shape of a cupcake without frosting, that is commonly made with flour, eggs, sugar, and butter. Together, "butter my muffin" could potentially refer to adding butter to a muffin, using butter to make a muffin, or using a muffin as a vehicle to eat butter.