such-and-such
such-and-such {adj. phr.}
Being one whose name has been forgotten or whose name does not need to be mentioned.
She told me to go to such-and-such a street and turn right.
Suppose, now, that we have such-and-such a group coming to the school, and we don't have enough chairs. What do we do then?
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Source: A Dictionary of American Idioms