Wiktionary
go potty
vb. 1 (&lit potty English) To go crazy or mad. 2 (context childish English) To use the potty; to defecate.
Usage examples of "go potty".
Thereafter she spent a good part of several days teaching the girl to keep her skirts down and to eat with her fingers instead of burying her face in the food and to go potty by herself without whining.
They also had decided that since they weren't going to be let out to go potty, it was time to do it indoors.
Couple of months learning all over again to go potty, wave bye-bye.