Reference to the train Mr. Hankey rides on in a South Park episode. A cute little song accompanies his arrival on the poo-choo train:
Mr. Hankey: Poo-Choo Train's layin' down its tracks with a -
Train Whistle: poo-choo
Mr. Hankey: - all the way and back!
Cartman: Poo-Choo Train is my favorite thing, spreading Christmas joy as we ride and sing!
Mr. Hankey: Christmastime wouldn't be the same without hugs and kisses and a Poo-Choo Train.
Socailly, Poo-Choo used to express the arrival or existence of something bad or unfortunate.
Mr. Hankey: Poo-Choo Train's layin' down its tracks with a -
Train Whistle: poo-choo
Mr. Hankey: - all the way and back!
Cartman: Poo-Choo Train is my favorite thing, spreading Christmas joy as we ride and sing!
Mr. Hankey: Christmastime wouldn't be the same without hugs and kisses and a Poo-Choo Train.
Socailly, Poo-Choo used to express the arrival or existence of something bad or unfortunate.
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Mistress: Oh crap - your wife is pulling into the driveway!
Man: The poo-choo train has arrived.
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Co-Worker: Are you ready to leave for the team-building ropes course?
Man: All aboard the poo-choo train.
Mistress: Oh crap - your wife is pulling into the driveway!
Man: The poo-choo train has arrived.
------------------------------------
Co-Worker: Are you ready to leave for the team-building ropes course?
Man: All aboard the poo-choo train.
by Wetchman September 11, 2006

Found in office bathrooms, it's when at least two cubicles are occupied- but no one wants to shit first. The stalemate is only broken when a diversion noise has been created, eg. a hand drier or another toilet flushing.
by northern Queensland September 25, 2008

by loller-tron October 14, 2008

Post drinking alcohol shits that are pasty in nature, thus one can never seem to get their asshole clean
by p00 July 16, 2006

by andrew December 4, 2002

by whup_ass_take_names November 29, 2003

Immensely smelly turd that is the perfect hangover cure. Going for a shit after a big night out will clear up your hangover in no time. Just remember to have some air freshner ready. Can Also be used with any other word to describe poo e.g. turd or shit
by dewster99 November 4, 2009
