Mr. Griffin is correct.  Here is the first usage of SWMBO from the book
"She" by H. Rider Haggard who also wrote "King Solomon's Mines":

"What is the color of the men?" said a deep voice in
answer.

"White is their color."

"Slay not," was the reply. "Four suns since was the
word brought to me from  She-who-must-be-obeyed
, 'White men come; if white men come, slay them not.
Let them be brought to the land of She-who-must-
be-obeyed.' Bring forth the men, and let that
which they have with them be brought forth also."

ChrisR
'90 Westy Auto "Blue Whale [SF SURF] which shares the garage with SWMBO's
4Runner [55*GOGO]

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Date:    Fri, 10 Nov 2000 17:04:54 -0500
From:    David Griffin <dgriffin1@HOME.COM>
Subject: SWMBO

From the book "She", by H. Rider Haggard. "She" is short for SWMBO, in the
book and film...

David Griffin