drive the big bus

drive the big bus

slang To vomit profusely into the toilet, usually as the result of drinking excessive amounts of alcohol. John was driving the big bus for the rest of the night after his seventh tequila shot.
See also: big, bus, drive
Farlex Dictionary of Idioms.

drive the big bus

and drive the porcelain bus and ride the porcelain bus
tv. to vomit into the toilet. Harry’s in the john driving the big bus. I guess that “drive the porcelain bus” refers to holding onto the toilet seat while you vomit.
See also: big, bus, drive
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • bus
  • drive the porcelain bus
  • bow to the porcelain altar
  • talk to Ralph on the big white (tele)phone
  • enamel
  • talk to Huey on the big white (tele)phone
  • shoot the cat
  • blow (one's) doughnuts
  • blow (one's) donuts
  • snap (one's) cookies