Uninj 

A toxic person who lays on his back 24/7 getting fat and has no friends

DeShawn: you started to act like a uninj

Uninj by Uninj May 31, 2020

Showing up uninvited 

in internet parlance, meant to convey the appearance of an unwanted or undesirable group of people that you weren't seeking out in the first place.

There was an interesting discussion about how to save up for retirement, but then all these bitcoin bros started showing up uninvited.

Showing up uninvited by JuliusCesarus July 11, 2021

Uninut 

A man with only one testicle.

Synonyms: Uni-ball, oddball, pansy, one nut,

Why do you guys always refer to Gregg as uninut? Oh, because his wife told us he only has one testicle. He's a real oddball.

Uninut by SwiftyDefines February 26, 2015

uninanonynymity 

the act of being the soul of discretion with the confidence of said friendship; not snitching your friend out when threats ensue.

Hank: "I'm here to save your life. But if I'm gonna do that, I'll need total uninanonynymity."

uninanonynymity by Charlie Nrocinu December 27, 2011

rage uninstall

When a person/deletes or uninstalls a game from their computer out of rage at the game.

Bob: Why isnt johnny playing Burnout with us?

Steven: He rage uninstalled when he couldnt beat a race in carrer mode.

rage uninstall by ANGRYUNIBROW November 19, 2011

Unijuwati 

An acronym of the words; Understanding Is Just Wasting Time.
Useful principle for dealing with a situation, typically at work, that does not make sense but you have to complete it anyway.

(Thanks to Dan T. for phonetically assembling the acronym.)

My boss told me to do something that makes no sense. It's driving me crazy.

Unijuwati man! Stop trying to understand it. Just finish it and move on.

Unijuwati by The Anti-Acronym Guy December 2, 2021

Uninflation

A term used by idiots in economics who have no idea what they are saying.

For example,
Student: Sir, I wrote an uninflation essay.
Teacher: What the fuck is uninflation you dumb ass?

Uninflation by Peter Plangettis March 28, 2015