- Ну и ну!
- Well, well! / What a thing! Expresses surprise, sometimes disapproval.
- Подумать только!
- Just imagine! Emphatic surprise.
- Ой, мамочки!
- Oh my goodness! Familiar, dramatic alarm or surprise.
- Вот это да!
- Wow! Strong surprise or admiration.
- Ещё бы!
- You bet! / Of course! Emphatic agreement; context may add a 'what did you expect?' tone.
- Что за чепуха!
- What nonsense! Dismissive; can offend someone whose idea you reject.
- Само собой!
- Of course! / Naturally! Treats something as obvious.
- Идёт!
- Deal! / Agreed! Accepts a suggestion or arrangement.
- Ни в коем случае!
- Under no circumstances! An emphatic refusal, usable beyond casual conversation.
- И в мыслях не было!
- It never crossed my mind! Denies having an intention.
- Ты что!
- What?! / Come on! Surprise, disbelief, reproach, or reassuring denial, depending on tone—not automatically 'Are you crazy?'
- Не может быть!
- No way! / It can't be! Expresses disbelief.
- Дело в шляпе!
- It's in the bag! A figurative idiom used as a reaction: success is assured or the matter is settled.