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]

Moby Thesaurus II by Grady Ward, 1.0:

106 Moby Thesaurus words for "wiggle":
   amble, barge, bowl along, bundle, clump, drag, fidget, flip out,
   flounce, flutter, foot, footslog, freak out on, get high on, glow,
   go pitapat, halt, have the fidgets, have the shakes, heave,
   hippety-hop, hitch, hobble, hop, jerk, jog, jolt, jump, limp,
   lumber, lunge, lurch, mince, pace, paddle, palpitate, pant, peg,
   piaffe, piaffer, plod, prance, quake, quaver, quiver, rack, roll,
   sashay, saunter, scuff, scuffle, scuttle, shake, shamble, shiver,
   shuffle, sidle, single-foot, skip, slink, slither, slog, slouch,
   squiggle, squirm, stagger, stalk, stamp, stomp, straddle, straggle,
   stride, stroll, strut, stump, swagger, swell, swell with emotion,
   swing, thrill, thrill to, throb, tingle, tingle with excitement,
   tittup, toddle, toss, toss and turn, totter, traipse, tremble,
   trip, trudge, tumble, turn on to, twist and turn, twitch, twitter,
   waddle, wag, waggle, wamble, wobble, worm, wriggle, writhe