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naff [naff 词源字典]: naff: [20] There seem to be two separate words naff in British slang, but the origins of both are mysterious. The first, naff off, appeared in the 1950s. Functionally it is a euphemistic substitute for fuck off, and there could be some connection with eff, another euphemism for fuck (perhaps the n in an eff wandered out of place). Alternatively it could come from naf, an old backslang reversal of fan in the sense ‘female genitals’.

The second, an adjective meaning ‘unstylish, unfashionable, tasteless’, is first recorded in 1969. Its antecedents are even more obscure. Among possible relatives are northern English dialect niffy-naffy ‘stupid’ and naffy, naffin and naffhead ‘idiot’ and Scots nyaff ‘unpleasant person’.
[naff etymology, naff origin, 英语词源]
atopy (n.): 1923, coined by Edward D. Perry, professor of Greek at Columbia University, at the request of medical men, from Greek atopia "unusualness, strangeness, a being out of the way," from atopos "out of place, strange, odd, eccentric," from a-, privative prefix (see a- (3)), + topos "place" (see topos).
dislocate (v.): c. 1600, from earlier adjective or past participle dislocate "out of joint" (c. 1400), from Medieval Latin dislocatus, past participle of dislocare "put out of place," from Latin dis- "away" (see dis-) + locare "to place" (see locate). Related: Dislocated; dislocating.
ecstasy (n.): late 14c., extasie "elation," from Old French estaise "ecstasy, rapture," from Late Latin extasis, from Greek ekstasis "entrancement, astonishment, insanity; any displacement or removal from the proper place," in New Testament "a trance," from existanai "displace, put out of place," also "drive out of one's mind" (existanai phrenon), from ek "out" (see ex-) + histanai "to place, cause to stand," from PIE root *sta- "to stand" (see stet).

Used by 17c. mystical writers for "a state of rapture that stupefied the body while the soul contemplated divine things," which probably helped the meaning shift to "exalted state of good feeling" (1610s). Slang use for the drug 3,4-methylendioxymethamphetamine dates from 1985. Formerly also spelled ecstasie, extacy, extasy, etc. Attempts to coin a verb to go with it include ecstasy (1620s), ecstatize (1650s), ecstasiate (1823), ecstasize (1830).
slip (v.): early 14c., "to escape, to move softly and quickly," from an unrecorded Old English word or cognate Middle Low German slippen "to glide, slide," from Proto-Germanic *slipan (cognates: Old High German slifan, Middle Dutch slippen, German schleifen "to glide, slide"), from PIE *sleib-, from root *(s)lei- "slimy, sticky, slippery" (see slime (n.)).

From mid-14c. with senses "lose one's footing," "slide out of place," "fall into error or fault." Sense of "pass unguarded or untaken" is from mid-15c. That of "slide, glide" is from 1520s. Transitive sense from 1510s; meaning "insert surreptitiously" is from 1680s. Related: Slipped; slipping. To slip up "make a mistake" is from 1855; to slip through the net "evade detection" is from 1902.
crooked: "Bent or twisted out of shape or out of place", Middle English: from crook, probably modelled on Old Norse krókóttr 'crooked, cunning'.