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1520s, shortened form of atwite, from Old English ætwitan "to blame, reproach," from æt "at" + witan "to blame," from Proto-Germanic *witanan (cf. Old English wite, Old Saxon witi, Old Norse viti "punishment, torture;" Old High German wizzi "punishment," wizan "to punish;" Dutch verwijten, Old High German firwizan, German verweisen "to reproach, reprove," Gothic fraweitan "to avenge"), from PIE root *weid- "to see" (see vision). For sense evolution, cf. Latin animadvertere, literally "to give heed to, observe," later "to chastise, censure, punish."
A contemptible and insignificant person; a trivial idiot: Craig Stevens as her twit of a husband/ I've got the authorization, you fucking twit
[1934+; origin unknown; rapidly adopted in the 1970s, perhaps because of the popularity of the British television series Monty Python's Flying Circus, on which the term was often employed]