The Collaborative International Dictionary of English v.0.48:

Gad \Gad\, v. i. [imp. & p. p. Gadded; p. pr. & vb. n.
   Gadding.] [Prob. fr. gad, n., and orig. meaning to drive
   about.]
   To walk about; to rove or go about, without purpose; hence,
   to run wild; to be uncontrolled. "The gadding vine."
   --Milton.
   [1913 Webster]

         Why gaddest thou about so much to change thy way?
                                                  --Jer. ii. 36.
   [1913 Webster]