Oh, come on now!

Meaning

A gentle nudge of disbelief or a protest against someone being unreasonable. It is used to keep a conversation light while signaling that you disagree.

Coaxing, mild

Used in a sentence

• Oh, come on now, you know that is not what I meant.
• You are going to tell me you can eat the whole pie by yourself? Oh, come on now.
• Oh, come on now, let us not fight over such a small thing.