over a year ago:
It is not a beautiful topic, yet there are so many names of it, that I just couldn't resist to mention some of them!
Organized after harold’s advice:
loo, the john, bathroom, lavatory, wash-room, rest room, convenience, boys' room, girls' room, gents', gents' room, ladies', ladies' room, privy, water-closet,
toilet, throne, latrine.