Sixty-nine Definition
The cardinal number following sixty-eight and preceding seventy.
Origin of Sixty-nine
From the rotational symmetry of the numeral 69 - if rotated a half-turn (by 180°), the numeral remains the same, and a couple both giving oral sex at once have, in principle, a similar rotational symmetry.
From Wiktionary
From the resemblance of the figure 69 to the position assumed by the two people
From American Heritage Dictionary of the English Language, 5th Edition
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