Source : Webster's Revised Unabridged Dictionary (1913)

Flounce \Flounce\, v. i. [imp. & p. p. {Flounced} (flounst); p.
   pr. & vb. n. {Flouncing}.] [Cf. OSw. flunsa to immerge.]
   To throw the limbs and body one way and the other; to spring,
   turn, or twist with sudden effort or violence; to struggle,
   as a horse in mire; to flounder; to throw one's self with a
   jerk or spasm, often as in displeasure.

         To flutter and flounce will do nothing but batter and
         bruise us.                               --Barrow.

         With his broad fins and forky tail he laves The rising
         sirge, and flounces in the waves.        --Addison.