I think vomitoriums were the exits from the stadiums - they vomited out the plebs after the games.
[eta]pretty much:
Quote:
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A vomitorium is a passage situated below or behind a tier of seats in an amphitheatre or a stadium, through which big crowds can exit rapidly at the end of a performance. They can also be pathways for actors to enter and leave stage.[1] The Latin word vomitorium, plural vomitoria, derives from the verb vomō, vomere, "to spew forth". In ancient Roman architecture, vomitoria were designed to provide rapid egress for large crowds at amphitheatres and stadiums, as they do in modern sports stadiums and large theatres.[2]
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https://en.wikipedia.org/wiki/Vomitorium