WordWeb Online

1. Something badly botched or muddled
   - cockup [Brit]

1. Make a mess of, destroy or ruin
   "I messed up the dinner and we had to eat out";
   - botch, bodge [Brit], bumble, fumble, botch up, muff, blow, flub [N. Amer], screw up, ball up, spoil, muck up, bungle, fluff, bobble [N. Amer], mishandle, louse up, foul up, butcher, goof up, balls up, cock up [Brit]
    
2. Disturb the smoothness of
   "mess up the surface of the water";
   - ruffle, ruffle up, rumple
    
3. Make a mess of or create disorder in
   "He messed up his room";
   - mess

Derived forms: messing up, mess-ups, messed up, messes up

Type of: disarrange, disarray, disorder, error, fail, fault, go wrong, miscarry, mistake