drive the porcelain bus

Humorous euphemism associating the position of the hands on a toilet seat while vomiting with holding a steering wheel.

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drive the porcelain bus (third-person singular simple present drives the porcelain bus, present participle driving the porcelain bus, simple past drove the porcelain bus, past participle driven the porcelain bus)

1. (idiomatic, euphemistic, humorous) To vomit, especially while drunk or hung over.

• See also Thesaurus:regurgitate