taking a fatty crap; the porcelain bus is another word for toilet, while riding it involves sitting on it &, well, pooping.
he's busy riding the porcelain bus... he won't be back for a while.
by becca vajayjay October 13, 2006
1 more definition
9 Words related to riding the porcelain bus
Top Definition
puking into the toilet.
Damn I drank a whole case last night and now I'm riding the porcelain bus.
by Nick D February 13, 2003

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