A snotty, materialistic person who is only concerned about their own welfare, but who deceives others into believing they actually have a soul.
Named after Daisy Buchanan from The Great Gatsby.
Tom: "Hey, did you see Daisy at the party?"
Nick: "Yeah. She's such a Buchanan, though. She was acting like she was way too good for the party."
Gatsby: "I still love her, though."