The Collaborative International Dictionary of English v.0.48:

Wiggle \Wig"gle\, v. t. & i. [Cf. Wag, v. t., Waggle.]
   To move to and fro with a quick, jerking motion; to bend
   rapidly, or with a wavering motion, from side to side; to
   wag; to squirm; to wriggle; as, the dog wiggles his tail; the
   tadpole wiggles in the water. [Prov. Eng. & Colloq. U. S.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Wiggle \Wig"gle\, n.
   Act of wiggling; a wriggle. [Colloq.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

wiggle
    n 1: the act of wiggling [syn: wiggle, wriggle, squirm]
    v 1: move to and fro; "Don't jiggle your finger while the nurse
         is putting on the bandage!" [syn: jiggle, joggle,
         wiggle]