vomit comet n. any form of transportation on which riders are (jocularly) said to become nauseated or seasick, such as an airplane that simulates zero-gravity conditions or a bus that transports late-night revelers. (source: Double-Tongued Dictionary)
Further reading
juicy noun. A person who illicitly carries alcohol in a water bottle. «Gwen Alexander, who’s been working at the Astoria pool for two years, confirms there haven’t been any issues with fighting this year but she said rule enforcement is...
Starting today, the Double-Tongued Dictionary is now a part of A Way with Words! That means that more than 18,000 dictionary records are now at home here and searchable from the top of every page. These are undocumented or under-documented words...
When I entered into the construction industry in 1974 a vomet comet was widely used to refer to the lunch wagon truck appearing before work, break and at lunch.
I did find one other use of the term used in that way, but the incidence didn’t seem common enough to warrant inclusion.