n. (pl. so-and-so's) 1 a particular person or thing not needing to be specified (told me to do so-and-so). 2 colloq. a person disliked or regarded with disfavour (the so-and-so left me behind).
SOAND-SO
Meaning of SOAND-SO in English
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012