waggling

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]