exclusively mutual 

when two events can occur only in conjunction with one another, i.e. neither one can occur without the other

Legend has it that being a tree-hugger and being a hippie are exclusively mutual.

Liberal: "Being homophobic and having repressed homosexual desires are exclusively mutual."
Conservative: "Hah, that's a good one."
Liberal: "Remember that recurring dream you told me about?"
Conservative: "...fuck"

Tim: "I wanna hook up with Kim, but Stacy's my girlfriend"
John: "I don't understand...those are exclusively mutual aren't they?"
Tim: "Whaaa..?"
John: "If you break up with Stacy, Kim will be pissed cuz they're good friends. a.k.a. no Kim for you. On the other hand, if you don't hook up with Kim, Stacy will get bored of your drama-lacking relationship and eventually dump you. And then Kim will think you're a loser, and again no Kim for you.
Tim: You are a genius. I'll be right back

exclusively mutual by javaman199 July 13, 2013

unilateral non disclosed temporary revocation of mutual exclusivity 

To Cheat or have an affair, its legalese

I had a unilateral non disclosed temporary revocation of mutual exclusivity with my gf last night when I hooked up with her sister.

Baby I did not cheat, we simply had a unilateral non disclosed temporary revocation of mutual exclusivity.

unilateral non disclosed temporary revocation of mutual exclusivity by Pedro the Poet September 20, 2011

mutually exclusive 

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.

mutually exclusive by snapy48 January 9, 2009