hacked upSufficiently {patched}, {kluge}d, and {tweaked} that the surgical scars are beginning to crowd out normal tissue (compare {critical mass}). Not all programs that are hacked become "hacked up"; if modifications are done with some eye to coherence and continued maintainability, the software may emerge better for the experience. Contrast {hack up}. [{Jargon File}] (1996-08-26)