Crapper (noun)

A slang term for a toilet or lavatory.

Origin:

The word crapper is thought to have originated as a slang term for a toilet in the early 20th century, most likely as a reference to thomas crapper, a 19th-century plumber and toilet manufacturer from england.

Examples:

1. I gotta take a leak, hold on a sec.
2. This place is a dump, the crapper is broken.
3. I need to go to the crapper, can you watch my stuff?
4. I'll be right back, just gotta hit the crapper.
5. I don't know where the crapper is in this building.