To go and use the potty: to leave in order to urinate or defecate.
I have to go potty!
To go crazy: to become insane.
(diminutive) A chamber pot, particularly (children) the pot used when toilet-training children.
(diminutive) Any other device or place for urination or defecation: a toilet; a lavatory; a latrine; an outhouse.
Insane.
The noise that the neighbour's kids were making was driving Fred potty.
Easy to pot the ball on.