go potty · verb1
From use of potty as a diminutive form of chamber pot.
go potty · verb2
From British use of potty as slang for insane, probably under influence from petty.
Etymology from Wiktionary, CC BY-SA 4.0.
go potty
Today it means: To go and use the potty: to leave in order to urinate or defecate. Full definition →