memory hole

/M EH1 M ER0 IY0 OW0 L/
noun
  1. 1

    A figurative place to which lost or forgotten information is sent, usually deliberately; nowhere.

  2. 2

    A fragment of physical address space which does not map to main memory.

  3. 3

    A memory leak.

Source: https://en.wiktionary.org/wiki/memory%20hole