Definition of "so-and-so" []

• An unnamed or unspecified person or thing. (noun)
• Informal A son of a gun. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Some would rush up with autograph books and have notes in the books—‘My name is so-and-so and you can reach me at such-and-such a number.’"
• "The office had called one day in a panic and said that one of our relatives had called and said that she wanted to bring her fiancé and her name was so-and-so."
• "If I don't know somebody, and … there's an instance where somebody was calling me and said, 'I got your number from so-and-so,' well, I may call so-and-so back and say, 'Did you tell them about my situation and everything?'"