Not letting someone join in on your conversation or you don't want to tell another person what you are talking about.
Sally- "hey Susan what are you and Tommy talking about?"
Susan- "none of your business!"
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1.When someone asks you something but you want it to be a secret so you won't say it.

2.Also used when you want to keep an information private.
A:Hey dude, where are you from?
B:It's none of your business.
by ErFy June 25, 2017
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A rude way to prevent someone from joining a conversation when they’ve done absolutely no wrong
Person 1: what kind of music are you into?
Person 2: I like pop music, especially J-pop, that’s the best kind
Person 3: I like J-pop, too!
Person 2 to Person 3: that’s cool
Person 1 to Person 3: None of your business, GTFO
Person 3 leaves and cries
by Delete this account now July 2, 2023
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Stay out of someone's conversation keep information that you want kept to yourself that you do you not want getting out there. A pretty lame way of saying I don't want you to know what I am talking about.
Guy says to a woman How are you?
Woman replies "None of your business."
by Wilburfrankainatra October 4, 2017
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Before, it was a phrase to notify someone not to get involved in whatever the situation is or what you're talking about. Now, it basically is apart of poor defense tactics used when a person abruptly joins your conversation, has their say and humiliates you by showing how wrong you are. Commonly used by actors in the show What Would You Do.
Boyfriend: Now get back inside, try on some clothes that makes you look more hot. NOW!!

Old Woman: Hey! Your girlfriend can wear what she likes! Your just being rude!!!

Boyfriend: Excuse me, let me sort this. It's none of your business.

Old Woman: I DONT CARE!!!
by Im (not) ME!!! September 20, 2011
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a wicked ass chick on myspace, she may be none of your business but hell every guy and girl wants her to be their business!
person 1: did you go on myspace last night?
person 2: yeah man, i got 7 adds, one of them was hotttt
person 1: oh yeah? who who?
person 2: none of your business
person 1: c'mon man don't be stingy
person 2: alix, you know, none of your business?
person 1: oh yeah, she's sexy (Y)
by acme-batterry June 25, 2008
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A thought-terminating cliché used to quell any critical thinking that may be used to expose someone's immoral/irresponsible/sordid actions and behaviours.

While there are occasions where this phrase is justified, most often than not it's used unjustifiably.
JUSTIFIED USE:
"So are you two sleeping together??"
"I'm sorry but that's none of your business"

UNJUSTIFIED USE:
*father verbally abuses their children on the bus*
Bystander: Excuse me but you should really treat your kids better
Father: Mate that's none of your business! Piss off!

UNJUSTIFIED USE:
Person 1: You shouldn't be smoking here, it's a smoke-free zone
Person 2: None of your business man
by Mary Mary Quite The Contrarian January 28, 2022
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