Definition of so-and-so noun from the Oxford Advanced American Dictionary

     

    so-and-so

     noun
    noun
    NAmE//ˈsoʊ ən ˌsoʊ//
     
    (pl. so-and-sos)(informal)
     
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  1. 1[usually singular] used to refer to a person, thing, etc. when you do not know their name or when you are talking in a general way What would you say to Mrs. So-and-so who has called to complain about a noisy neighbor?
  2. 2an annoying or unpleasant person. People sometimes say so-and-so to avoid using an offensive word He's an ungrateful so-and-so.
See the Oxford Advanced Learner's Dictionary entry: so-and-so