so-and-so
noun
Definitions
A placeholder name for a person or thing, used when a name is not known; a generic name.
Example: Business letters normally begin "Dear Mr So-and-So".
Some thing or things.
Example: He will tell you to do so-and-so, but read the instructions first, anyway.
Used for epithets such as SOB, bastard, etc..
Example: That miserable so-and-so messed up my work!