Green’s Dictionary of Slang

potty n.1

[SE pot, which they mend]

a tinker.

[UK]J. Ware Passing Eng. of the Victorian Era.

In compounds

potty parade (n.)

(NZ prison) the morning emptying of cell chamberpots.

[NZ]D. Looser ‘Boob Jargon’ in NZEJ 13 34: potty parade n. The emptying out of cell chamberpots.