Noun

A Drug/Alcohol concoction created by comedian Doug Stanhope. The instructions for creating a Xanadoo were first explained by Stanhope on the "The Opie and Anthony Show" sometime in 2007 (or possibly 2008).

A Xanadoo consists of:

Equal parts Xanax and Psychedelic Mushroom caps, ground (usually with a coffee grinder), and poured into Jagermeister shots.

Aside from Stanhope himself and maybe a few unreported cases, the effects of a Xanadoo are largely unknown. Most likely they are (at least) a combination effects from all of its ingredients. I.E. tripping, relaxation, euphoria, blurred vision, and coordination problems.