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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.
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