1. They’re fans of the Olivia-Newton John movie Xanadu
2. They’re fans of Citizen Kane
3. They’re fans of Coleridge
4. They’re fans of the obscure DC comics fortune-telling character Madame Xanadu
I kinda hope it’s option #1.
Don’t look now, kid, but I think he wants to introduce a foreign substance into your precious bodily fluids.