such and such

such and such

Any unspecified or unnamed person, place, thing, time, etc. Anyway, the landlady said that she would deal with it and such and such would call us later to confirm the details. I'm meeting them at such and such a time—seven o'clock, I think.
See also: and, such
Farlex Dictionary of Idioms.

such and such

someone or something whose name has been forgotten or should not be said. Mary said that such and such was coming to her party, but I forgot their names. If you walk into a store and ask for such and such and they don't have it, you go to a different store.
See also: and, such
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

such and such

Not specified, unnamed and undetermined, as in They agreed to meet at such and such a time and place. [Mid-1500s]
See also: and, such
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • (Someone or something) called, they want their (something) back!
  • a bad apple spoils the (whole) barrel
  • a rotten apple spoils the (whole) barrel
  • a rotten apple spoils the (whole) bunch
  • a rotten apple spoils the (whole) bushel
  • bushel
  • one rotten apple spoils the (whole) barrel
  • one rotten apple spoils the (whole) bunch
  • one rotten apple spoils the (whole) bushel
  • rotten apple spoils the barrel