да ну?

да ну?(!)

разг.

ho?!; really?, indeed?, honestly?; you don't say! are you for real? Amer.; isn't that nice!; not really!

- Вот он раздумал ехать. И я тоже. - Да ну? - ахнул Прохор, от изумления чуть не выронив банку из рук. (М. Шолохов, Тихий Дон) — 'He's changed his mind about going. And so have I.' 'You don't say!' Prokhor groaned almost dropping a flask in his amazement.