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Saying: (When the) Tapioca Went Sour
Signifies when things started to go downhill.

Used most frequently with a strong Minnesotan accent.
My dog, Scorchy, was doing fine until the tapioca went sour. Now he is 6 feet under.

Friend Eh: "How's your day going, eh?"
Friend Beh: "It was going fine until the tapioca went sour"
by Scorchy Likes Tapioca May 14, 2018
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