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Unchanged or effectively unchanged. Used largely in financial markets.
The S&P 500 was unched today. It closed at the same level as yesterday.
unched by Chris McL December 13, 2008

Rapid Unscheduled Disassembly 

"RUD" for short. In high-power hobby rocketry, an unforeseen event usually attributed to an exploding rocket motor that send pieces of the rocket in every direction, quickly.
That rocket just suffered a "Rapid Unscheduled Disassembly"... DUCK

Unchecked Aggression 

This is when an individual exhibits irritability for a rational reason, but is unable to convey that their “aggression” is warranted to those in the vicinity, so it goes “unchecked”.

Someone with unchecked aggression is not necessarily dangerous, just misunderstood in the moment.
*man on street yelling and throwing fits in air from frustration due to a problem at work or home*

*beat cop walking on street witnesses act*

Cop: “hey sir, calm down”

Man on street: “FUCK, MIND YOUR OWN BUSINESS

Cop: *uses radio*

“yeah dispatch, im gonna need backup squad cars and a K9 unit. We have an individual displaying unchecked aggression”

*Cop fires 6 warning shots into the chest of the man on the street*

Cop: “stop resisting!”

Bystander #1: “Wow. I’m glad that man is no longer alive. He was scary.”

Bystander #2: “ARE YOU KIDDING?! YOU SHOT HIM???? HE WASNT DOINT ANYTHING WRONG”
When you have been touched, fondled, fingered or coitaled by your uncle.
Hun, Aunt Rachel called and wants to know if you want to spend the weekend with cousin Tommy. No thanks mom. I get uncled every time I go there. I was really sore the last time. Ok. I’ll tell her maybe.

Pretty sure I got uncled last night about midnight. The door opened and then a pillow over my face and some quick moving hands.
Uncled by Eaton Holgoode June 15, 2018

uncledaddy 

the incestual phenonmenon of one man being both the uncle and daddy to a child; i.e., a man impregnates his sister and is thus, the uncledaddy to the resulting child.
Lila Mae gave her sweet uncledaddy a hummer, while basking beneath the sensual glow of the bug zapper in the backyard.
uncledaddy by Brian Wilson May 18, 2004

unceeded 

Land never released, given, sold etc to any colonial government by an Aboriginal community. Term used particularly in Canada but relevant to many states around the world.
Much of British Columbia is traditional unceeded First Nations land.
unceeded by Student0932840293. November 23, 2010