Fuck is an English word that is generally considered profane which, in its most literal meaning, refers to the act of sexual intercourse. However, by extension it may be used to negatively characterize anything that can be dismissed, disdained, defiled, or destroyed.
The Oxford English Dictionary states that the ultimate etymology is uncertain, but that the word is "probably cognate" with a number of native Germanic words with meanings involving striking, rubbing, and having sex.
Flen flyys and freris
The usually accepted first known occurrence is in code in a poem in a mixture of Latin and English composed some time before 1500. 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. Removing the substitution cipher (here, replacing each letter by the next letter in alphabetical order, as the English alphabet was then) on the phrase "gxddbov xxkxzt pg ifmk" yields non sunt in coeli, quia fvccant vvivys of heli, which translated means, "They are not in heaven because they fuck wives of Ely". The phrase was coded likely because it accused some Church personnel of misbehaving; it is uncertain to what extent the word fuck was considered acceptable at the time. (The stem of fvccant is an English word used as Latin: English medieval Latin has many examples of writers using English words when they did not know the Latin word: "workmannus" is an example.) (In the Middle English of this poem, the term wife was still used generically for woman.)
John le Fucker
A man's name, "John le Fucker", is said to be reported from AD 1278, but the report is doubtful: an email discussion on Linguist List says:
This name has been exhaustively argued over ... The "John le Fucker" reference first appears in Carl Buck's 1949 Indo-European dictionary. Buck does not supply a citation as to where he found the name. No one has subsequently found the manuscript in which it is alleged to have appeared. If the citation is genuine and not an error, it is most likely a spelling variant of "fulcher", meaning soldier.
An Anglo-Saxon charter granted by Offa, king of Mercia, dated AD 772, granting land at Bexhill, Sussex to a bishop, includes this text in a mixture of Anglo-Saxon language and Latin:
Þonne syndon þa gauolland þas utlandes into Bexlea in hiis locis qui appellantur hiis nominibus: on Berna hornan .iii. hida, on Wyrtlesham .i., on Ibbanhyrste .i., on Croghyrste .viii., on Hrigce .i., on Gyllingan .ii., on Fuccerham 7 and on Blacanbrocan .i., on Ikelesham .iii.;
Then the tax-lands of the outland belonging to Bexley are in these places which are called by these names: at Barnhorne 3 hides, at Wyrtlesham [Worsham farm near Bexhill ] 1, at Ibbanhyrst 1, at Crowhurst 8, at (Rye? The ridge north of Hastings?) 1, at Gillingham 2, at Fuccerham and at Blackbrook [may be Black Brooks in Westfield village just north of Hastings ] 1, at Icklesham 3.
The placename Fuccerham may or may not be related to the verb "fuck", which in Anglo-Saxon would probably have been fucian = "to fuck", ic fucie = "I fuck".
The word has probable cognates in other Germanic languages, such as German ficken (to fuck); Dutch fokken (to breed, to strike, to beget); dialectal Norwegian fukka (to copulate), and dialectal Swedish fokka (to strike, to copulate) and fock (penis). This points to a possible etymology where Common Germanic fuk– comes from an Indo-European root meaning "to strike", cognate with non-Germanic words such as Latin pugnus "fist". By reverse application of Grimm's law, this hypothetical root has the form *pug–. In early Proto-Germanic the word was likely used at first as a slang or euphemistic replacement for an older word for intercourse, and then became the usual word for intercourse.
Yet another possible etymology is from the Old High German word pfluog, meaning "to plow, as in a field". This is supported in part by a book by Carl Jung, Psychology of the Unconscious: A Study of the Transformations and Symbolisms of the Libido, in which he discusses the "primitive play of words" and the phallic representation of the plough, including its appearance on a vase found in an archaeological dig near Florence, Italy, which depicts six ithyphallic (erect-penised) men carrying a plow.
The original Indo-European root for to copulate is likely to be * h3yebh– or *h3eybh–, which is attested in Sanskrit यभति (yabhati), Russian ебать (yebat'), Polish jebać, and Serbian jebati, among others: compare the Greek verb οἴφω (oíphō) = "I have sex with", and the Greek noun Ζέφυρος (Zéphyros) (which references a Greek belief that the west wind Zephyrus caused pregnancy).
Via Latin or Greek
Other possible connections are to Latin futuere (almost exactly the same meaning as the English verb "to fuck"); but it would have to be explained how the word reached Scandinavia from Roman contact, and how the t became k. From fūtuere came French foutre, Catalan fotre, Italian fottere, Romanian futere, vulgar peninsular Spanish follar and joder, and Portuguese foder. However, there is considerable doubt and no clear lineage for these derivations. These roots, even if cognates, are not the original Indo-European word for to copulate, but Wayland Young (who agrees that these words are related) argues that they derive from the Indo-European *bhu– or *bhug– ("be", "become"), or as causative "create" [see Young, 1964]. A possible intermediate might be a Latin 4th-declension verbal noun *fūtus, with possible meanings including "act of (pro)creating".
Greek phyō (φύω) has various meanings, including (of a man) "to beget", or (of a woman), "to give birth to". Its perfect pephyka (πέφυκα) can be likened to "fuck" and its equivalents in other Germanic languages.
One reason that the word fuck is so hard to trace etymologically is that it was used far more extensively in common speech than in easily traceable written forms. There are several urban-legend false etymologies postulating an acronymic origin for the word. None of these acronyms were ever heard before the 1960s, according to the authoritative lexicographical work The F-Word, and thus are backronyms. In any event, the word fuck has been in use far too long for some of these supposed origins to be possible. Some of these urban legends are that the word fuck came from Irish law. If a couple were caught committing adultery, they would be punished "For Unlawful Carnal Knowledge In the Nude", with "FUCKIN" written on the stocks above them to denote the crime. Another theory is that of a royal permission. During the Black Death in the Middle Ages, towns were trying to control populations and their interactions. Since uncontaminated resources were scarce, many towns required permission to have children. Hence, the legend goes, that couples that were having children were required to first obtain royal permission (usually from a local magistrate or lord) and then place a sign somewhere visible from the road in their home that said "Fornicating Under Consent of King", which was later shortened to "FUCK". This story is hard to document, but has persisted in oral and literary traditions for many years; however, it has been demonstrated to be an urban legend.
Короче, в двух словах, приведеное происхождение FUCK так же мнимо, как то, что ИМХО произошло от "имею мнение х.. оспоришь"