о чём вы

what were you talking about

→ о
phrase Common #3,765
what were you talking about Used to ask about the topic of a conversation; in context can also mean "what are you talking about".
RU: О чём вы говорили с учителем?
EN: What did you talk about with the teacher?

Том даже не знает, о чём вы.

Tom doesn't even know what you're talking about.

И о чём вы с ними говорили?

And what did you talk to them about?

— Несколько хороших парней (1992)

Я так и не понял, о чём вы.

I still didn't understand what you were talking about.

О чём вы так беспокоитесь?

What are you so worried about?

— Таксист (2017)

О чём вы?

What are you talking about?

— Приключения Паддингтона 2 (2017)

О чём вы с ней говорили?

What did you talk to her about?

О чём вы с ними разговаривали?

What did you talk to them about?

О чём вы, чёрт возьми, думали?

What the hell were you thinking?

Не понимаю о чём вы.

I don't understand what you're talking about.

— Тайна в его глазах (2009)

Я понимаю, о чём вы меня просите, но я не буду этого делать.

I understand what you're asking me to do, but I won't do it.