Source : Free On-Line Dictionary of Computing

buried treasure
     
        A surprising piece of code found in some program.  While
        usually not wrong, it tends to vary from crufty to
        bletcherous, and has lain undiscovered only because it was
        functionally correct, however horrible it is.  Used
        sarcastically, because what is found is anything *but*
        treasure.  Buried treasure almost always needs to be dug up
        and removed.  "I just found that the scheduler sorts its queue
        using {bubble sort}!  Buried treasure!"
     
        [{Jargon File}]