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3.
A term used to reference a toilet, in the manner of porcelain pony. The term is most often employed in reference to the use thereof.
"Man, I hope this class is over soon; I gotta ride the porcelain bus like crazy!"
by Bob Trees April 30, 2006
 
1.
Name given to the toilet when vomiting, used in reference to holding the seat while spewing in the same manner as you would hold a bus steering wheel. Not to be confused with the porcelain pony as quoted above
Shit, I had a few too many jagers, I think i may need to drive the porcelain bus
by timb082 February 04, 2009
 
2.
when your drunk and ready to vomit you hang on to the toilet with both hands.
I had to drive the "porcelain bus," last night.
by Ima.AssOe June 21, 2014