Otherwise, the usually accepted first known occurrence of the word is found in code in a poem in a mixture of Latin and English composed in the 15th century.
The poem, which satirizes the Carmelite friars of Cambridge, England, takes its title, "Flen flyys", from the first words of its opening line, Flen, flyys, and freris ("Fleas, flies, and friars").
The line that contains fuck reads Non sunt in coeli, quia gxddbov xxkxzt pg ifmk.
Deciphering the phrase "gxddbov xxkxzt pg ifmk", here by replacing each letter by the previous letter in alphabetical order, as the English alphabet was then, yields the macaronic non sunt in coeli, quia fvccant vvivys of heli, which translated means, "They are not in heaven, because they fuck wives of Ely".
The word is considered obscene, but is common in many informal and familiar situations.
It is unclear whether the word has always been considered vulgar, or, if not, when it first came to be used to describe (often in an extremely angry, hostile or belligerent manner) unpleasant circumstances or people in an intentionally offensive way, such as in the term motherfucker, one of its more common usages in some parts of the English-speaking world.
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