Someone that is crazy about donuts, and eats them several times a week, no matter what time of day. Someone that is so crazy about donuts they have multiple conversations about donuts and even texts pictures of them to their friends.
He is so donutty, that he sent me pictures of donutstwice this week.
A person you hate intensely not because they deserve such hatred but because they serve as a focus for your general hatred. A healthy way to dispense with excess animosity.
Jake's not really that big an asshole. He just serves as my hate sink.