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

某某人;某某东西

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。