mutually assured destruction

Difficult to define exactly, but it's not the actual *name* of a situation or doctrine. Rather, it describes the outcome of a given action in the circumstances:
In the case of the US and USSR, their shared determination to retaliate to an attack by the other - given the size of their nuclear arsenals - would've assured mutual destruction.
by Richter September 20, 2003
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Mutual appreciation day

Mutual appreciation day is when you appreciate and make out with your favorite mutuals
by Daddy big foot June 15, 2021
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The point at which you and another person get so passive-aggressive to each other that it doesn't matter who started it, because at this point you're both just plain douchebags.
Person A turns down the thermostat. Person B waits for A to leave, turns it back up. Repeat until one has to leave out of frustration. This is the point of mutually assured douchebaggery.
by thatguy20 July 06, 2012
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mutual brain licking

The act of three beautiful and talented AMPers coming together to share thoughts, challenges and ideas for the mutual benefit of all parties. Discussions take place with such speed and uniformity of understanding that it would appear as though the members are licking the ideas out of each others heads - hence the term.
Hi Mark, did you solve that big problem?

Yes Pete, I had a session with Ryan and SJ and sorted it all out whilst also benefitting them both. It were a right proper mutual brain licking.
by mutualbrainlicker February 24, 2016
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Super Ex-Mutuals

a group of people on Stan Twitter consisting mostly of Swifties that are skinny iconic legends

although it had a fall out due to one dumb bitch, it still lives on today as Ethan Hate Cult
“OMG like literally Kosta is the fattest person in the Super Ex-Mutuals.”
by taylena1989 June 01, 2019
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mutually assured destruction

The outrightly suicidal strategy of nations protecting themselves from nuclear (or, in more recent days, chemical or biological) attack by preparing enough weapons to reduce the attacking country to rubble even as they are themselves wiped out.

Basically, if you're going to be screwed over, make sure the rest of the world is, too.
During the Cold War, the US and the USSR built massive stockpiles of nuclear weapons while following a strategy of mutually assured destruction
by Sparky August 31, 2003
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Nutual (nut mutual)

when the urge or want to NUT someone is mutual
yeah I though it was one sided but apparently the feeling was nutual (nut mutual) . I'm so in love.
by sstelladoc March 16, 2018
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