Source : WordNet®

fuckup
     n 1: someone who makes mistakes because of incompetence [syn: {bungler},
           {blunderer}, {fumbler}, {bumbler}, {stumbler}, {sad
          sack}, {botcher}, {butcher}]
     2: an embarrassing mistake [syn: {blunder}, {blooper}, {bloomer},
         {bungle}, {foul-up}, {flub}, {botch}, {boner}, {boo-boo}]