Visiting Aunt Jones.

David S. Reynolds’ NYRB review (February 22, 2024; archived) of Sensationalism and the Jew in Antebellum American Literature by David Anthony provides repellent instances of “hostile portraits of Jews in various realms of US culture during the two decades before the Civil War,” but I’m bringing it here for this passage:

It has been said that nineteenth-century America was mawkishly sentimental—a culture of pap and prudery against which serious authors like Hawthorne, Herman Melville, Edgar Allan Poe, and Walt Whitman rebelled. To some extent this was true, as evidenced by the era’s didactic novels, religious tracts, and codes of proper decorum. It was an age when Evangeline St. Clare, the angelic heroine of Harriet Beecher Stowe’s best seller Uncle Tom’s Cabin, inspired millions, and when, in polite circles, undergarments were called “unmentionables,” legs “limbs,” men’s trousers “continuations,” and a trip to the bathroom “visiting Aunt Jones.”

We all know about “unmentionables” and “limbs,” and the OED confirms that use of “continuations” (though it doesn’t sound much like a euphemism: “Gaiters continuous with ‘shorts’ or knee-breeches, as worn by bishops, deans, etc. Hence in later slang, trousers, as a continuation of the waistcoat”; 1883 citation “For fear of spilling it over what a tailor would call my continuations”), but I can find nothing to back up the claim about “visiting Aunt Jones” except the footnoted source for the assertion, R.W. Holder’s How Not to Say What You Mean: A Dictionary of Euphemisms (Oxford University Press, 2007). The relevant entry in that volume reads

aunt² a lavatory
To whom many women say they are paying a
visit. In Victorian days it was their Aunt Jones.

Which sounds more like the notoriously chatty and unreliable Eric Partridge than a dependable reference work, and I can find no examples of this alleged usage in Google Books. Is anyone familiar with it?