Meaning of blue room | Babel Free

Definitions

1. In cinema, a room with blue (or occasionally green) walls in which effects shots are filmed.
2. The toilet/washroom on a passenger aircraft.
   slang

Examples

“Phyllis Ash was working a flight where the smooth routine was suddenly interrupted by a ten-year-old boy who went to the "blue room" (toilet) and proceeded to get his penis stuck in his zipper.”

“[…] they intended to use the “blue room”, or lavatory.”

CEFR level