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KISS, n. A word invented by the poets as a rhyme for "bliss." It is supposed to signify, in a general way, some kind of rite or ceremony appertaining to a good understanding; but the manner of its performance is unknown to this lexicographer.

Ambrose Bierce (2016). “The Devil's Dictionary: The Devil World”, p.120, 谷月社
KISS, n. A word invented by the poets as a rhyme for bliss. It is supposed to signify, in a general way, some kind of rite or ceremony appertaining to a good understanding; but the manner of its performance is unknown