Hey ... someone in the Cinci Enquirer, inter alia, gets the vomitorium thing right:

IV - Word of the day: A security official at Dolphin Stadium informed waiting media members that additional vomitoriums were open farther down the concourse. It's not as disgusting as it sounds - a vomitorium is an architectural feature, a passage situated below or behind a tier of seats in an amphitheater or an exit through which a crowd can "spew out" at the end of a show or a game.

V - More puke: For a game that uses Roman numerals, it's appropriate to note a popular misconception about the Romans is that they made use of a room called a vomitorium for the purpose of vomiting between meals to make room for more food. Historians say only a minority of the highest classes indulged in this practice.

... I can't recall ever seeing mention of bulimish behaviour at the Roman table ... is it in Petronius?