A statistical term saying the probability of two events cannot occur at the same time.
A "milf" is an example of something non mutually exclusive; as a mom occuring and being hot occuring, can indeed happen at the same time.
by snapy48 January 9, 2009
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Best friends that are a step more than besties but not quite romantic partners.
Kristen and Frank were exclusive besties because they would always been seen together and if they were ever apart people would ask where is your other half. They would share their deepest, darkest secrets with each other.
by Naya Coleman July 4, 2015
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The period of a relationship between "just friends" and "dating". In this phase both people haven't made the commitment for an official relationship, but each would be upset if the other got involved with someone else.
He took is relationship status off of Facebook. He must be exclusively not dating.
by Mavtak January 13, 2010
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refers to an ambiguous relationship agreement whereby both parties mutually agree to only "sleep" with each other on a casual basis, but have not made their intimate relationship publicly known. This relationship agreement is characterized by minimal or no PDA (Public Display of Affection).

In addition, the parties may go out to dinner, movies etc. They may even meet the each other's friends. And yet, the person is introduced by their first name, no last name. Neither person is bound to the other. Most importantly, there are no long, drawn out telephone conversations with each other, the phone is used merely to establish a date and time for the next meeting. Everything is in the semblance of having a relationship, minus the PDA and commitment. This agreement can be terminated at anytime.

Typically, it is established early on that one person wants to have a casually exclusive agreement, and the other party will either comply or not.
This ambiguous relationship agreement is above “f**k buddies” or “bed buddies” and is one below dating.
Sample Introduction to friends: “This is Jeremy, my friend.”

Sample Request for a Casually Exclusive Agreement: “Hey, you’re great. We have fun together, but I just don’t have the time for a serious commitment. Let’s say we have a casually exclusive agreement? Whereby, we agree to only sleep with each other – for the sake of safe sex, but let’s keep it light and casual. We can call each other when we have time, and have get together when we can. We can still go out to dinner and all that fun stuff, but I’m really not big into PDA’s. So what do you think? You game?”
by Dr. Sheldon Cooper July 16, 2009
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When people don't want you to listen to their conversation, so they start talking in a language you don't understand.
Did you ask her how she got it?" "No, she pulled a Foreign Exclusion on me.
by adiz97 April 7, 2011
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If a person did something u didn't like or if it was something u really didn't like it's an exclusive; or is some body really mess up you or your crew then he or she os labeled as a fuckboy exclusive
Aye see that fuckboy exclusive over there?....he told me the wrong answers on the test what a beezy.
by Biscotti112 October 23, 2013
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