West central
The Slang Dictionary Etymological Historical and Anecdotal · 1913 · p. 30
a water-closet, the initials being the same as those of the London Postal District. It is said that for this reason very delicate people refuse to obey Rowland Hill’s instructions in this particular. An old maid, who lived in this district, was particularly shocked at having W.C. marked on all her letters, and informed the letter-carrier that she could not think of submitting to such an indecent fashion. On being informed that the letters would not be forwarded without the obnoxious initials, she remarked that she would have them left at the Post-Office. “Then, marm,” said the fellow, with a grin, “they will put P.O. on them, which will be more ondacenter than the tother.”
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