The term "John" as a slang for bathroom is thought to have originated from Sir John Harington, an English courtier. He is credited with inventing the modern flushing toilet in the late 16th century, hence the association. Over time, the term "John" became a colloquialism for the toilet or bathroom.
'Bog' is a slang term sometimes used in Britain for a toilet.
"Toilet papier" is the term for toilet paper in Afrikaans.
An old (but still used elsewhere) term for public rest room, washroom, bathroom.
John Crapper invented the first toilet.
"The head".
A big white telephone is a slang term for a toilet, especially when used as a receptacle in which to vomit.
A biffy is a term used in the United States for a toilet or an outhouse.
The term "water-closet" was an early term for a room with a toilet http://en.wikipedia.org/wiki/Flush_toilet
it was the first flush toilet
The toilet was invented by Sir John Harington in 1590.
the inventor of the toilet