earwigyoudaoicibaDictYouDict[earwig 词源字典]
earwig: [OE] A colloquial Old English term for ‘insect’ was wicga (which would have been pronounced something like ‘widger’). It probably came from the same prehistoric Germanic base (*wig-) as produced English wiggle [13], and so is roughly equivalent in spirit to modern English creepy-crawly. There used to be a belief (perhaps still is) that earwigs creep into people’s ears and penetrate inside their heads, and so the Anglo-Saxons called them ēarwicga, literally ‘ear-insect’. The same notion lies behind French perceoreille, literally ‘pierceear’, and German ohrwurm, literally ‘earworm’, both of which stand for ‘earwig’.
=> wiggle[earwig etymology, earwig origin, 英语词源]
creepy (adj.)youdaoicibaDictYouDict
1794, "characterized by creeping," from creep + -y (2). Meaning "having a creeping feeling in the flesh" is from 1831; that of producing such a feeling, the main modern sense, is from 1858. Creepy-crawly is from 1858.
higgledy-piggledyyoudaoicibaDictYouDict
"confusedly, hurriedly," 1590s, a "vocal gesture" [OED] probably formed from pig and the animal's suggestions of mess and disorder. Reduplications in the h-/p- pattern are common (as in hanky-panky, hocus-pocus, hinch(y)-pinch(y), an obsolete children's game, attested from c. 1600).

Edward Moor, "Suffolk Words and Phrases" (London, 1823), quotes a list of reduplications from Ray's "Collection of English Words" (1768), all said to "signify any confusion or mixture;" the list has higgledy-piggledy, hurly-burly, hodge-podge, mingle-mangle, arsy-versy, kim-kam, hub-bub, crawly-mauly, and hab-nab. "To which he might have added," Moor writes, crincum-crankum, crinkle-crankle, flim-flam, fiddle-faddle, gibble-gabble, harum-scarum, helter-skelter, hiccup-suickup, hocus-pocus, hotch-potch, hugger-mugger, hum-drum, hum-strum, hurry-scurry, jibber-jabber, prittle-prattle, shilly-shally, tittle-tattle, and topsy-turvy. Many of them seem to date to the 16th century.
goggayoudaoicibaDictYouDict
"An insect or creepy-crawly", Afrikaans, from Khoikhoi xo-xon, a collective term for slithering and creeping creatures.