Source : Webster's Revised Unabridged Dictionary (1913)

Twig \Twig\, v. t. [imp. & p. p. {Twigged}; p. pr. & vb. n.
   {Twigging}.] [Cf. {Tweak}.]
   To twitch; to pull; to tweak. [Obs. or Scot.]

Twig \Twig\, v. t. [Gael. tuig, or Ir. tuigim I understand.]
   1. To understand the meaning of; to comprehend; as, do you
      twig me? [Colloq.] --Marryat.

   2. To observe slyly; also, to perceive; to discover. ``Now
      twig him; now mind him.'' --Foote.

            As if he were looking right into your eyes and
            twigged something there which you had half a mind to
            conceal.                              --Hawthorne.

Twig \Twig\, n. [AS. twig; akin to D. twijg, OHG. zwig, zwi, G.
   zweig, and probably to E. two.]
   A small shoot or branch of a tree or other plant, of no
   definite length or size.

         The Britons had boats made of willow twigs, covered on
         the outside with hides.                  --Sir T.
                                                  Raleigh.

   {Twig borer} (Zo["o]l.), any one of several species of small
      beetles which bore into twigs of shrubs and trees, as the
      apple-tree twig borer ({Amphicerus bicaudatus}).

   {Twig girdler}. (Zo["o]l.) See {Girdler}, 3.

   {Twig rush} (Bot.), any rushlike plant of the genus {Cladium}
      having hard, and sometimes prickly-edged, leaves or
      stalks. See {Saw grass}, under {Saw}.

Twig \Twig\, v. t.
   To beat with twigs.

Source : WordNet®

twig
     n : small branch or division of a branch; usually applied to
         branches of the current or preceding year [syn: {branchlet},
          {sprig}]
     v 1: branch out in a twiglike manner; "The lightning bolt twigged
          in several directions"
     2: understand, usually after some initial difficulty; "She
        didn't know what her classmates were plotting but finally
        caught on" [syn: {catch on}, {get wise}, {get onto}, {tumble},
         {latch on}, {cotton on}, {get it}]
     [also: {twigging}, {twigged}]

Source : Free On-Line Dictionary of Computing

TWIG
     
        Tree-Walking Instruction Generator.
     
        A {code generator} language.  {ML-Twig} is an {SML/NJ}
        variant.
     
        ["Twig Language Manual", S.W.K. Tijang, CS TR 120, Bell Labs,
        1986].
     
        (1995-01-31)