you're telling me

You're telling me! (something that you say to emphasize that you agree with something someone has just complained about because you have experienced it yourself.) — Вы это МНЕ говорите? А то я не знаю! А то я сам не знаю! Да я и сам знаю.

Example: 'Jane's really bad-tempered these days.' 'You're telling me!' (CIDI)

opp.
[так я и поверил!]