fagyoudaoicibaDictYouDict[fag 词源字典]
fag: English has three distinct words fag, none of whose origins is altogether clear. The oldest is the one which denotes ‘drudgery’. It is first recorded as a verb in the 16th century, meaning ‘droop, decline’; its more common noun uses, ‘hard boring work’ and ‘boy who does tasks for an older boy in a British public school’, appear to have developed in the late 18th century.

It is generally taken to have been originally an alteration of flag ‘lose vigour, droop’, although there is no conclusive proof of this. Fag ‘cigarette’ [19] is an abbreviation of fag-end [17], which originally meant generally ‘extreme end’. It was a compound formed from an earlier fag [15], whose underlying meaning seems to have been something like ‘piece hanging down loosely, flap’ (and which conceivably could be related to fag ‘drudgery’). Fag ‘homosexual’ [20] is short for faggot [13], a derogatory term applied to male homosexuals in American English since the early 20th century; the usage is probably based on the slightly earlier uncomplimentary use of the word for ‘woman’. Faggot means literally ‘bundle of sticks’, and comes via Old French fagot from Italian faggotto (which is used also for ‘bassoon’).

This in turn is a diminutive form of Vulgar Latin *facus, which was based ultimately on Greek phákelos ‘bundle’. The notion of applying a term for ‘bundle’ abusively to ‘women’ is perhaps echoed in baggage.
[fag etymology, fag origin, 英语词源]
abusive (adj.)youdaoicibaDictYouDict
1530s (implied in abusively), originally "improper," from Middle French abusif, from Latin abusivus, from abus-, past participle stem of abuti (see abuse (v.)). Meaning "full of abuse" is from 1580s. Abuseful was used 17c., and Shakespeare has abusious ("Taming of the Shrew," 1594). Related: Abusiveness.
dirt (n.)youdaoicibaDictYouDict
15c. metathesis of Middle English drit, drytt "mud, dirt, dung" (c. 1300), from Old Norse drit, cognate with Old English dritan "to void excrement," from Proto-Germanic *dritan (cognates: Dutch drijten, Old High German trizan). Used abusively of persons from c. 1300. Meaning "gossip" first attested 1926 (in Hemingway); dirt bike is 1960s. Dirt-cheap is from 1821. Dirt road attested by 1852.