The Collaborative International Dictionary of English v.0.48:

Twit \Twit\, v. t. [imp. & p. p. Twitted; p. pr. & vb. n.
   Twitting.] [OE. atwiten, AS. [ae]tw[imac]tan to reproach,
   blame; aet at + w[imac]tan to reproach, blame; originally, to
   observe, see, hence, to observe what is wrong (cf. the
   meanings of E. animadvert; akin to G. verweisen to censure,
   OHG. firw[imac]zan, Goth. fraweitan to avenge, L. videre to
   see. See Vision, Wit.]
   To vex by bringing to notice, or reminding of, a fault,
   defect, misfortune, or the like; to revile; to reproach; to
   upbraid; to taunt; as, he twitted his friend of falsehood.
   [1913 Webster]

         This these scoffers twitted the Christians with.
                                                  --Tillotson.
   [1913 Webster]

         Aesop minds men of their errors, without twitting them
         for what is amiss.                       --L'Estrange.
   [1913 Webster]

WordNet (r) 3.0 (2006):

twit
    n 1: someone who is regarded as contemptible [syn: twerp,
         twirp, twit]
    2: aggravation by deriding or mocking or criticizing [syn:
       twit, taunt, taunting]
    v 1: harass with persistent criticism or carping; "The children
         teased the new teacher"; "Don't ride me so hard over my
         failure"; "His fellow workers razzed him when he wore a
         jacket and tie" [syn: tease, razz, rag, cod,
         tantalize, tantalise, bait, taunt, twit, rally,
         ride]

Moby Thesaurus II by Grady Ward, 1.0:

216 Moby Thesaurus words for "twit":
   Parthian shot, accuse, allege, anthem, arraign, article, ass,
   back answer, badinage, ballad, banter, barrack, berate, blame,
   blockhead, book, bring accusation, bring charges, bring to book,
   cackle, cajole, call, carol, caustic remark, caw, censure, chaff,
   chant, charge, chatter, cheep, chide, chirk, chirp, chirr, chirrup,
   chitter, choir, chorus, chuck, chump, cite, clack, cluck,
   cock-a-doodle-doo, comeback, complain, contemn, coo, crack, croak,
   cronk, croon, crow, cuckoo, cut, cut at, cutting remark, denounce,
   denunciate, deride, descant, dig, dig at, do-re-mi, dope, drum,
   dump, dump on, exchange, fasten on, fasten upon, finger, fleer,
   flout, fool, foolery, fooling, fooling around, gabble, gaggle,
   gibe, gibing retort, give-and-take, gobble, good-natured banter,
   guggle, hang something on, harmless teasing, haze, honk, hoo, hoot,
   hum, hymn, idiot, imbecile, impeach, imply, impute, indict,
   inform against, inform on, insinuate, intonate, intone, jab,
   jab at, jape, jeer, jeer at, jerk, jest, jibe, jive, joke, jolly,
   josh, kid, kidding, kidding around, lay charges, leg-pull, lilt,
   lodge a complaint, lodge a plaint, lout, make fun of, minstrel,
   mock, moron, needle, nincompoop, ninny, nitwit, parting shot, peep,
   persiflage, pin on, pip, pipe, pleasantry, pooh, pooh-pooh,
   prefer charges, press charges, psalm, put down, put on,
   put on report, put-down, put-on, quack, quaver, quip, quiz, rag,
   rail at, raillery, rally, rallying, rank out, razz, report,
   reprehend, reproach, reprove, revile, rib, ride, ridicule, roast,
   roll, roulade, rude reproach, scoff, scold, scorn, scout,
   scurrility, serenade, shake, short answer, simpleton, sing,
   sing in chorus, slam, slap, slap at, sneer, sneer at, sol-fa,
   solmizate, sport, squawk, swipe, take to task, task, taunt,
   taunt with, tax, tease, tremolo, trill, troll, tweak, tweedle,
   tweedledee, tweet, twitter, upbraid, verbal thrust, vocalize,
   warble, whistle, yodel