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When something is so mad that you have to mix the words mental and insanity
"He actually did a backflip off the first floor. Mentality"
A particular attitude or way of thinking, especially one that you think is wrong or stupid.
(尤指被视为错误或愚蠢的)心态
a get-rich-quick mentality

一夜暴富的心态

I can't understand the mentality of people who hurt animals.

He buys everything on credit - he has this play now, pay later mentality.

Mentality Gang

(adjective) What your band teacher uses to describe you after they compare themselves to the victims of the Parkland Shooting because she feels threatened that people don’t like her.
“You guys have Mentality Gang and shouldn’t come on the Hawaii trip!”
Mentality Gang by Jonny213 May 28, 2018

Mentality.dev 

A lua pasted by Vortex for nl. Pasted from hydra tech old ver. All thanks to Legendary
Mentality.dev by Prefect21 July 3, 2023

Mentality Bro 

Someone who has never trained to fight in any way shape or form but believes they are competent in a fight regardless. Famously saying things like, "You just don't know my mentality, bro! I see red and bodies hit the floor!"
"Did you hear John called you out?" "I'm not worried, he's just a Mentality Bro."

Spite Monkey Mentality

The sort of mental attitude exhibited by the majority of teenagers worldwide; arrogance, inexperience, and self-absorption coupled with lack of insight, narrow mindedness and a total inability to accept that they could ever be wrong. It is just this sort of chip on the shoulder attitude that causes them to clog up Urban Dictionary with ridiculously silly definitions that stand no hope of ever being accepted, to compete with each other to produce the most sickeningly disgusting sexual perversion, to attempt to boost their, already over-inflated, egos with self-aggrandising descriptions of themselves or to denigrate people they don’t like with descriptions that they don’t have the balls to put their names to, because if they did they would be sued for libel. It’s the sort of mental attitude that, when their submission is rejected, throws all of its toys out of the pram and rejects everyone else’s definitions out of infantile spite.

It is to be hoped that eventually they will grow up and maybe grow a pair although it must be said that many of them never do, retaining even into old age an immature sense of entitlement.
Spite Monkey Mentality is unfortunately prevalent amongst the teens, pre-teens and post teens who have invaded Urban Dictionary.
More from Urban Dictionary

Slop Grenade

When someone uses AI to generate a large document, slide deck, or piece of code/software and tosses it over the fence for you to deal with.
Chad: Hey Brent I sent you the new backend API change to review, it’s only 100 files changed.

Brent: he just tossed me a slop grenade
Slop Grenade by Joe Squid September 28, 2026
Word of the Day on September 29, 2026
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
After we broke up, he was floxi to me.
floxi by Dr. Geek May 13, 2009
Word of the Day on September 28, 2026
NYC people who migrate north to Quahog, RI to see the leaves in the fall.
New York and everyone from there can fornicate themselves with an iron stick.
leafers by ss++ February 8, 2005
Word of the Day on September 27, 2026

Respectfully 

Precedes or follows either a gratuitously disrespectful or honest remark, originated in New York City. Used in similar fashion to "no offense" or "to be honest," interchangeably.
Ya mans is wild buns, respectfully. Respectfully he's washed.

After school, The Modells on Jamaica Ave was active. Respectfully.
Respectfully by john quan the first December 20, 2020
Word of the Day on September 26, 2026
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