The Collaborative International Dictionary of English v.0.48:

balls-up \balls-up\ n.
   something badly botched or muddled; a foul-up. [British]

   Syn: ballup, cockup, mess-up, foul-up.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

balls-up
    n 1: something badly botched or muddled [syn: ballup, balls-
         up, cockup, mess-up]