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Mrs. Jones
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Noun
?
en slang euphemism dated An outhouse; a toilet.
1961, Jan S. Doward, They Came to Wrong Way Home (page 58)
to the "Mrs. Jones," as they called it. Obviously they had gone together for courage, and no one thought any more about it until suddenly they both started screaming. The toilet was not far from the house
References
en 1873 John Camden Hotten The Slang Dictionary