Mrs. Jones en · NOUN
Meanings
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(dated, euphemistic, slang) An outhouse; a toilet.
[…] 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 […]
1961, Jan S. Doward, They Came to Wrong Way Home (page 58)