Source : Webster's Revised Unabridged Dictionary (1913)

Waggle \Wag"gle\, v. i. [Freq. of wag; cf. D. waggelen, G.
   wackeln.]
   To reel, sway, or move from side to side; to move with a
   wagging motion; to waddle.

         Why do you go nodding and waggling so?   --L'Estrange.

Waggle \Wag"gle\, v. t. [imp. & p. p. {Waggled}; p. pr. & vb. n.
   {Waggling}.]
   To move frequently one way and the other; to wag; as, a bird
   waggles his tail.

Waggle \Wag"gle\, n.
   A waggling or wagging; specif. (Golf), the preliminary
   swinging of the club head back and forth over the ball in the
   line of the proposed stroke.

Source : WordNet®

waggle
     n : causing to move repeatedly from side to side [syn: {wag}, {shake}]
     v 1: move from side to side; "The happy dog wagged his tail"
          [syn: {wag}]
     2: move unsteadily or with a weaving or rolling motion [syn: {wamble}]