Donut is the name of a food that looks like bagels with flavor, thanks to the frosting on it. Homer Simpson likes this food, alot. You can also wear it like a ring and eat it. The sprinkles add even more flavor too.
Luigi hates these because they look like his children, however, jelly donuts don't look like bagels, nor do those long ones filled with cream, Luigi still hates them. All donuts are protected by Homer Simpson, which we know, since he's been doing it since first bite, so if you throw away a donut, he's coming for you.