lavvy

noun2

1. •
   (UK, slang) A lavatory: a room used for urination and defecation.

   • It must be great getting up during the night and not having to put a coat on over your jammies to visit the lavvy on the half-landing – especially in the winter when it's below zero. — 2011
2. •
   (UK, slang) A toilet: a fixture used for urination and defecation.