- (slang) A toilet bowl.
Etymology: From it being imagined that when gripping the sides of the bowl while vomiting into it that it's like a bus driver gripping the steering wheel of a bus (a bus steering wheel being roughly horizontal, as opposed to a car which has it up at an angle).
- 2005: DON'T trade the tour bus for the porcelain bus. You can eat, drink and be merry " not sorry " when overseas. — Escape Magazine travel advice http://escape.news.com.au/index/0,9138,36335,00.html
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