smallest room

Variant of small room (“lavatory”).

smallest room (plural smallest rooms)

1. (euphemistic, with definite article) The lavatory: the room intended for urination and defecation.
   • 1989, Grant Naylor, Red Dwarf:

     "Aliens used up our bog roll?"
     "Just because they're aliens, it doesn't mean they don't have to visit the smallest room. Only, they probably do something weird and alienesque; like it comes out of the top of their heads, or something."

• See Thesaurus:bathroom

• little house
• small room