Source : Webster's Revised Unabridged Dictionary (1913)

Fidget \Fidg"et\, v. i. [imp. & p. p. {Fidgeted}; p. pr. & vb.
   n. {Fodgeting}.] [From {Fidge}; cf. OE. fiken to fidget, to
   flatter, Icel. fika to hasten, Sw. fika to hunt after, AS.
   befician to deceive. Cf. {Fickle}.]
   To move uneasily one way and the other; to move irregularly,
   or by fits and starts. --Moore.

Fidget \Fidg"et\, n.
   1. Uneasiness; restlessness. --Cowper.

   2. pl. A general nervous restlessness, manifested by
      incessant changes of position; dysphoria. --Dunglison.

Source : WordNet®

fidget
     n : a feeling of agitation expressed in continual motion; "he's
         got the fidgets"; "waiting gave him a feeling of
         restlessness" [syn: {fidgetiness}, {restlessness}]
     v : move restlessly; "The child is always fidgeting in his seat"