This is a Brit Euphemism used in polite society for a common word that starts with P has an IS in the middle and ends with S.

It comes from the common practice of having to pay 1d (one old penny) to use a public loo. When you get “caught short.”

Pay to Pee ?

I’ve been ordered for about 3 days to watch this video.

Just watched. And have now translated the Spend a Penny bit :o)