The Collaborative International Dictionary of English v.0.48:

Romp \Romp\, v. i. [imp. & p. p. Romped; p. pr. & vb. n.
   Romping.] [A variant of ramp. See Ramp to leap,
   Rampallian.]
   1. To play rudely and boisterously; to leap and frisk about
      in play.
      [1913 Webster]

   2. To go rapidly and without strained effort.
      [PJC]

   3. To win easily; -- often used with over, in sports games;
      as, the Yankees romped over the Boston Red Sox, 10-2.
      [PJC]