<jargon, programming> Sufficiently patched, kluged, 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.
hackathon « hack attack « hacked off « hacked up
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