write-only code

from Jargon File (4.4.4, 14 Aug 2003)

write-only code
 n.

   [a play on read-only memory] Code so arcane, complex, or
   ill-structured that it cannot be modified or even comprehended by
   anyone but its author, and possibly not even by him/her. A {Bad
   Thing}.

from The Free On-line Dictionary of Computing (8 July 2008)

write-only code

   [a play on "read-only memory"] Code so arcane, complex, or
   ill-structured that it cannot be modified or even comprehended
   by anyone but its author, and possibly not even by him/her.  A
   {Bad Thing}.

   [{Jargon File}]

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