Definitions by Nurse!

chateaued 

To be extremely drunk whilst retaining a classy demeanor: especially when one is drinking expensive wine.
Comes from the French word Chateau meaning a large house or mansion usually with grounds, gardens and often it's own vineyard.

Pierre: "Oh Buffy, this '78 Bordeaux is fabulous!"
Buffy: "Oh yes Pierre, I've had 3 bottles already...(hits floor)."
Pierre: "Well, looks like Buffy is chateaued."

chateaued by Nurse! June 21, 2006