[Cheburashka]

A vomitorium isn't what you probably think it is.

http://www.straightdope.com/columns/021101.html

[macamadamia]

a passageway in an amphitheater or theater that opened into a tier of seats from below or behind


I know, I know....but I went with it anyway.
I was thinking of cacatorium but I don't think that would have sounded right:)