Source : Webster's Revised Unabridged Dictionary (1913)

Squiggle \Squig"gle\, v. i. [Cf. Prov. E. swiggle to drink
   greedily, to shake liquor in a close vessel, and E. sqig.]
   To shake and wash a fluid about in the mouth with the lips
   closed. [Prov. Eng.] --Forby.

Squiggle \Squig"gle\, v. i. [Cf. {Squirm}, {Wiggle}.]
   To move about like an eel; to squirm. [Low, U.S.] --Bartlett.

Source : WordNet®

squiggle
     n 1: a short twisting line [syn: {curlicue}]
     2: an illegible scrawl; "his signature was just a squiggle but
        only he could make that squiggle"