So-and-so Definition

sōən-sō
so-and-sos
noun
so-and-sos
Some person or thing whose name is either not specified or not known.
Webster's New World
A son of a gun.
American Heritage
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.
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.
YourDictionary
Some thing or things.
He will tell you to do so-and-so, but read the instructions first, anyway.
Wiktionary

(euphemistic) Used for epithets such as SOB, bastard, etc..

That miserable so-and-so messed up my work!
Wiktionary
Synonyms:
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Other Word Forms of So-and-so

Noun

Singular:
so-and-so
Plural:
so-and-sos
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