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出典:Wiktionary
From use of potty as a diminutive form of chamber pot.
go potty (三人称単数 現在形 goes potty, 現在分詞 going potty, 過去形 went potty, 過去分詞 gone potty)
From British use of potty as slang for insane, probably under influence from petty.
go potty