In the UK, "potty" is an informal term with two main meanings.
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Silly or Slightly Crazy: "Potty" can describe someone who is acting in a foolish, eccentric, or somewhat insane manner. It suggests that the person's behavior is irrational or unconventional.
- Example: "She must have been potty to sell that car so cheaply!"
- Example: "I'd go potty if I had to work here all the time."
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Being Very Enthusiastic or Obsessed About Something/Someone: "Potty about something/someone" means being extremely fond of or infatuated with them.
- Example: "He's potty about his new motorbike."
- Example: "She's completely potty about that actor."
Therefore, "potty" is a colloquial British term denoting either silliness/craziness or intense enthusiasm.