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 for crock
From The Free On-line Dictionary of Computing (30 December 2018) :

     [American scatologism "crock of shit"] 1. An awkward feature
     or programming technique that ought to be made cleaner.  For
     example, using small integers to represent error codes without
     the program interpreting them to the user (as in, for example,
     Unix "make(1)", which returns code 139 for a process that dies
     due to segfault).
     2. A technique that works acceptably, but which is quite prone
     to failure if disturbed in the least.  For example, a
     too-clever programmer might write an assembler which mapped
     instruction mnemonics to numeric opcodes
     algorithmically, a trick which depends far too intimately on
     the particular bit patterns of the opcodes.  (For another
     example of programming with a dependence on actual opcode
     values, see The Story of Mel.)  Many crocks have a tightly
     woven, almost completely unmodifiable structure.  See kluge,
     brittle.  The adjectives "crockish" and "crocky", and the
     nouns "crockishness" and "crockitude", are also used.
     [{Jargon File]

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