1
general::
Phrase(s): 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.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Not specified, unnamed and undetermined, as in They agreed to meet at such and such a time and place. [Mid-1500s]
American Heritage Idioms