none of your concern 

What people say when you get too nosy.

Also what people say when you ask for too many details.

Hey Sam, I slept with this guy a few months ago
What? When? Who?

Nevermind. It is none of your concern.

none of your concern by Unco Sam December 9, 2015

None of your concern 

Another way of saying “none of your business”

Teacher: I gotta go on a date tomorrow so you’ll have a substitute

Student: Ooh, who are you going on a date with?
Teacher: That’s none of your concern

None of your concern by Fortnite1500 November 5, 2021