so-and-so
noun informal uk/ˈsəʊ.ən.səʊ/ us/ˈsoʊ.ən.soʊ/
(PERSON NOT NAMED)
[ U ]某某人;某某东西
used instead of a particular name to refer to someone or something, especially when the real name is not important or you have forgotten it
She always keeps me up to date with the latest gossip - you know, so-and-so from down the road is having a baby and so-and-so's just bought a car. 她总会把最新的小道消息及时告诉我——你知道吗，路那头的某某人怀上了孩子，某某人刚买了汽车。
(UNPLEASANT PERSON)
[ C ]令人讨厌的人，令人不快的人
a polite way of referring to an unpleasant person
Mr Baker was such a so-and-so - he was always really mean! 贝克先生真是个讨厌的家伙——他总是十分刻薄！