Best definition
Canadian for restroom.

American: “Excuse me, sir, where is the restroom?”

Canadian: “The washroom is over there at the end of the hall by the elevators.”
washroom: define #2
A room containg atleast a toilet and sink. Public washrooms may have urinals. Personal washrooms may have bath tub or shower.
Hey Bud, I got to go to the washroom to take a leak