[Prob. cognate with Dutch fokken to mock (15th cent.), to strike (1591), to fool, gull (1623), to beget children (1637), to have sexual intercourse with (1657), to grow, cultivate (1772), Norwegian regional fukka to copulate, Swedish regional fokka to copulate (cf. Swedish regional fock penis), further etymology uncertain: perh. < an Indo-European root meaning ‘to strike’ also shown by classical Latin pugnus fist (see PUGNACIOUS adj.). Perh. cf. Old Icelandic fjúka to be driven on, tossed by the wind, feykja to blow, drive away, Middle High German fochen to hiss, to blow. Perh. cf. also Middle High German ficken to rub, early modern German ficken to rub, itch, scratch, German ficken to have sexual intercourse with (1558), German regional ficken to rub, to make short fast movements, to hit with rods, although the exact nature of any relationship is unclear.
On the suggested Indo-European etymology (and for a suggestion that the word was probably a strong verb during its earlier history in English) see especiallyR. L ASS ‘Four letters in search of an etymology’ in Diachronica 12 (1995 ) 99-111.
It seems certain that the word was current (in transitive use) before the early 16th cent., although the only surviving attestation shows a Latin inflectional ending in a Latin-English macaronic text: see quot. a1500 and note at sense 1b. See discussion at FUCKER n. on various supposed (but very doubtful) earlier occurrences of the word in surnames. However, if the bird name WINDFUCKER n. (also FUCKWIND n.) is ult. related, it is interesting to note an occurrence of the surname Ric' Wyndfuk', Ric' Wyndfuck' de Wodehous' (1287 in documents related to Sherwood Forest) which may show another form of the bird name. For discussion of a possible (although not certain) occurrence of FUCKING n. in a field name fockynggroue recorded in a Bristol charter of c1373 see R. COATES ‘Fockynggroue in Bristol’ in N. & Q. 252 (2007 ) 373-6.
Many alternative theories have been suggested as to the origin of this word. Explanations as an acronym are often suggested, but are obviously much later rationalizations.
Despite widespread use over a long period and in many sections of society, fuck remains (and has been for centuries) one of the English words most avoided as taboo. Until relatively recently it rarely appeared in print, and there are still a number of euphemistic ways of referring to it (cf. e.g. EFF v., FECK v.2, F-WORD n., F-WORD v.). It is also frequently written with asterisks, dashes, etc., to represent suppressed letters, so as to avoid the charge of obscenity. Modern quotations for the term before the 1960s typically come from private sources or from texts which were privately printed, esp. on the mainland of Europe. Bailey (1721) included the word (defined ‘Foeminam Subagitare’), but not Johnson (1755), Webster (1828), and later 19th- and early 20th-cent. dictionaries. Partridge (1937) included the word as ‘f*ck’, noting that ‘the efforts of James Joyce and D. H. Lawrence have not restored it to its orig. dignified status [in dictionaries]’. A gradual relaxation in the interpretation of obscenity laws in the U.K. followed the unsuccessful prosecution in 1960 of Penguin Books Ltd. (under the Obscene Publications Act of 1959) for the publication in the London edition of D. H. Lawrence's Lady Chatterley's Lover (see, for example, quot. 1928 at sense 1b). The first modern dictionary of general English to include an entry for the verb fuck was G. N. Garmonsway's Penguin English Dictionary of 1965).]

[Cf. ‘Fuckwind, a species of hawk. North.’ (Halliwell).]

1. A name for the kestrel: cf. WINDHOVER.
1599 NASHE Lenten Stuffe 49 The kistrilles or windfuckers that filling themselues with winde, fly against the winde euermore.

2. fig. as a term of opprobrium.
1602 Narcissus MS. Rawl. Poet. 212, lf. 80, I tell you, my little windfuckers, had not a certaine melancholye ingendred with a nippinge dolour overshadowed the sunne shine of my mirthe, I had beene I pre, sequor, one of your consorte. 1609 B. JONSON Silent Wom. I. iv. (1620) C3b, Did you euer heare such a Wind-fucker, as this? c1611 CHAPMAN Iliad Pref. A4, There is a certaine enuious Windfucker, that houers vp and downe, laboriously ingrossing al the air with his luxurious ambition. a1616 BEAUM. & FL. Wit without M. IV. i, Husbands for Whores and Bawdes, away you wind-suckers [sic ed. 1639].

[Origin uncertain; perh. < FUCK v. + WIND n.1 Cf. earlier WINDFUCKER n. and discussion in W. B. LOCKWOOD Oxford Dictionary of British Bird Names (1993 ) at windfucker n.]

The kestrel. Cf. WINDFUCKER n. 1.
1847 J. O. HALLIWELL Dict. Archaic & Provinc. Words I. (at cited word), Fuckwind, a species of hawk. North.

[Abbrev. of fragmentation (grenade).]

To throw a fragmentation grenade at one's superior officer, esp. one who is considered over-zealous in his desire for combat. So {sm}fragging vbl. n.
1970 Daily Colonist (Victoria, B.C.) 9 Dec. 5/4 Another spectacular technique is ‘fragging’. ‘To frag’ is a term meaning to use a fragmentation grenade ‘to cool the ardor of any officer or NCO too eager to make contact with the enemy’. 1971 Courier-Mail (Brisbane) 19 May 1/3 There were 209 fragging incidents last year, according to the Army and 34 deaths were listed as probably due to these. 1972 Sat. Rev. 8 Jan. 12/1 Fragging is a macabre ritual of Vietnam in which American enlisted men attempt to murder their superiors. The word comes from the nickname for hand grenades, a weapon popular with enlisted men because the evidence is destroyed with the consummation of the crime.

Also drek. [a. Yiddish drek (G. dreck) filth, dregs, dung, f. MHG. drec:{em}Gmc. *{th}rekka- repr. by OE. {th}reax rubbish, rottenness, ON. {th}rekkr, OFris. threkk. Ult. origin uncertain but connection with Gr. {sigma}{kappa}{alpha}{tau}{goacu}{fsigma} dung, {sigma}{tau}{epsilon}{rho}{gamma}{gaacu}{nu}{omicron}{fsigma} privy, L. stercus excrement is generally accepted.]

Rubbish, trash, worthless debris.
1922 JOYCE Ulysses 511 Farewell. Fare thee well. Dreck! 1947 Horizon Feb. 90 The anonymous countryside littered with heterogeneous dreck. 1965 E. LACY Double Trouble v. 58 Drek your dolls are!.. I wouldn't stick my customers with such junk! 1966 E. WEST Night is Time for Listening i. 13 ‘You are dreck,’ she said. ‘I hope you are killed.’ 1967 O. HESKY Time for Treason v. 38 Meat better than the usual drek we get.