mutually assured 

Normally heard in the context of `mutually assured destruction`; when something is mutually assured, it is guaranteed to happen to both parties involved. This phrase is normally linked to discussions involving nuclear weapons, where `mutually assured destruction` means that we are all guaranteed to die.

Hindsight is always 20-20
But looking back it's still a bit fuzzy
Speak of mutually assured destruction?
Nice story...tell it to Reader's Digest!

- Megadeth, _Sweating Bullets_

mutually assured by Wingchild September 13, 2003

mutually assured friend zone 

The state of being in which two people both cock block each other into the friend zone even though they are both attracted to and want to be with each other.

They are then relegated to the state of perpetual friend zone with much regret yet they never know what it is that they failed to achieve.

Thus these two attractive people are forced to for ever interact and want yet not connect.

Bob and Anna MAFZ’d each other on Saturday; it was painful to watch. Mutually Assured Friend Zone (MAFZ)for the win.

mutually assured friend zone by IFYG DRM December 28, 2018

mutually assured destruction

a.k.a. MAD, refers to the military stalemate between Russia and USA between late 1940 and the present. The basic premise is that each side has so many nuclear weapons in its arsenal, that strike/counter strike would destroy both combatants.

mutually assured destruction by Anonymous September 3, 2003

Mutually beneficial 

She can't afford the lifestyle, bills, drugs, partying, school etc,, so she found a guy to take care of her. She gives him what he wants and he gives her what she wants, a mutually beneficial relationship.

She can't afford the lifestyle, bills, drugs, partying, school etc,, so she found a guy to take care of her. She gives him what he wants and he gives her what she wants, a mutually beneficial relationship.

Mutually beneficial by Scalded_Ape October 6, 2018

mutually beneficial relationship 

A relationship where you both benefit. For example she gives you a blowjob and you pay her car payment. Usually a Sugar daddy/sugar baby arrangement. Since it's not a one time thing and you are building a "relationship," it's not prostitution.

I am looking for a handsome man to have a mutually beneficial relationship with.

mutually beneficial relationship by Salami sandwhich December 22, 2017

mutualism 

A symbiotic relationship in which both species benefit.

Clownfish live among the poisonous tentacles of a sea anemone. The clownfish are protected from predators, and they keep the sea anemone clean.

mutualism by Diana Stephens February 14, 2005

Mutually Assured Destruction

When a couple mutually decide at the same time to end a relationship with no chance of ever being in relationship with one another ever again. Basically Nuke with Salted Earth only both mutually agree and launch nukes with salted earth at the same time. Or in response to knowing a break up notice is approaching.

Kyle and Kimberly are not together; it was mutually assured destruction.

Mutually Assured Destruction by Liberation Theology October 28, 2019