WC is not tweet for "will call"

Overheard by Hubby in a downtown restaurant’s men’s room:

British man: “I say, I don’t know why they call them restrooms. I don’t see anyone resting.”

British man’s friend: “Right-o. In Canada they call them washrooms. That’s a little closer to the truth.” 

Hubby: (to himself) “And water closet is more to the point?”