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so-and-so plural so-and-so's
1 [uncountable] used to refer to a particular person or thing when you do not give a specific name [↪ such and such]: 
I'd find myself thinking, 'I wonder what so-and-so is doing?'
I'd find myself thinking, 'I wonder what so-and-so is doing?'2 [countable] a very unpleasant or unreasonable person - used when you want to avoid using a swear word : Peter can be a real so-and-so at times.
Peter can be a real so-and-so at times.
