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]

The Collaborative International Dictionary of English v.0.48:

Romp \Romp\, n.
   1. A girl who indulges in boisterous play.
      [1913 Webster]

   2. Rude, boisterous play or frolic; rough sport.
      [1913 Webster]

            While romp-loving miss
            Is hauled about in gallantry robust.  --Thomson.
      [1913 Webster]

WordNet (r) 3.0 (2006):

romp
    n 1: an easy victory [syn: runaway, blowout, romp,
         laugher, shoo-in, walkaway]
    2: a girl who behaves in a boyish manner [syn: tomboy, romp,
       hoyden]
    3: gay or light-hearted recreational activity for diversion or
       amusement; "it was all done in play"; "their frolic in the
       surf threatened to become ugly" [syn: play, frolic,
       romp, gambol, caper]
    v 1: play boisterously; "The children frolicked in the garden";
         "the gamboling lambs in the meadows"; "The toddlers romped
         in the playroom" [syn: frolic, lark, rollick,
         skylark, disport, sport, cavort, gambol, frisk,
         romp, run around, lark about]
    2: run easily and fairly fast
    3: win easily; "romp a race"