black magic

( n.)

   [common]  A  technique  that  works, though nobody really understands
   why.  More  obscure  than  {voodoo programming}, which may be done by
   cookbook.  Compare also {black art}, {deep magic}, and {magic number}
   (sense 2).

[glossary]
[Reference(s) to this entry by made by: {black art}{FM}{magic}{voodoo programming}]