@fmf said
A so-and-so is also a person whose name does not need to be specified or is not known.
The idea of this thread is to replace "so-and-so" with various types of people.
The plural of so-and-so is not "so-and-so's", as you seem to think. Your error is a common one.
Word then apostrophe then s indicates the possessive. As in: "Is that so-and-so's car parked in my space" w ...[text shortened]... she is referring to.
I wrote "so-and-soes" as the plural because I thought it was mildly funny.
https://www.britannica.com/dictionary/so%E2%80%93and%E2%80%93so
so–and–so
/ˈsowənˌsoʊ/
noun
plural so–and–sos or so–and–so's /ˈsowənˌsoʊz/
informal
1
[noncount] — used when the name of a person is unknown or not important
She's always gossiping and telling people that so-and-so [=some person] is getting married or divorced or something.
Let's say Mr. So-and-so, who is related to you, asks to borrow $1,000. Would you give it to him?
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2
[count] : a rude or annoying person
He's an arrogant so-and-so.
I can't believe that stupid so-and-so got the job.
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It would be awesome if you could authenticate what you think an answer is before delivering it in a tsunami of scorn.
But suit yourself. Some people apparently like appearing ignorant.