House of Lords

noun2

1. •
   (Scotland, slang) A urinal.
2. •
   (slang, old-fashioned) A lavatory: a room used for urination and defecation.

   • In between you have the Business Man Jocular: ‘I say, where's the geography, old son?’ or ‘When you need the House of Lords, it's through there.’ — 1967