It's/That's not on

We use this expression to say that something is not acceptable.

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Written	Yes
Spoken	Yes
Formal	No
Informal	Yes

Example 1

Shut up and get me something to eat.
Don't talk to me like that. It's not on.

Example 2

He's told me I have to stay here until I finish everything.
That's not on. It's already midnight. You need to get some sleep.

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