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so-and-so

So-and-so is used as a stand-in for a name that you aren't sure of, or in place of using a vulgar expression.

(noun)

An example of when you might use the expression "so-and-so" is when someone at a party told you that the stock market was crashing but you don't remember her name. You might say "so-and-so said the stock market is crashing."
An example of so-and-so is when you call someone a stupid so-and-so.

See so-and-so in Webster's New World College Dictionary

Informal some person or thing whose name is either not specified or not known: often used euphemistically in place of a strong or vulgar, disparaging epithet

See so-and-so in American Heritage Dictionary 4

noun pl. so-and-sos so-and-sos