I always assumed that O was a hug, because it made me think of wrapping my arms around someone, and that X was a kiss by elimination.
XO is also some kind of alcoholic beverage, is it not?
An acronym standing for "eXtra Old" qualifying cognac as having aged in oak barrels for at least 6.5 years.
Older and more expensive than VSOP or VO.
In the American (and Canadian: thanks Palpz) Armed Forces, XO is an informal way of addressing a second in command, being an abbreviation of eXecutive Officer
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