chuuni 

Short for the Japanese "chuunibyou", which roughly means "second year of middle school sickness". It's an adjective for describing teenagers who try to act cool by being super mature or different, or dark and edgy, but fail miserably because they're still thirteen.

They will often pretend to be criminal or have a "bad boy/girl" image, attach themselves to an obscure musical or artistic subculture, or create super cool imaginary alter-egos of themselves, making sure to post plenty of terrible fan-art and fan-fiction about it online.

"Man, I cringe so hard whenever I remember all the chuuni shit I did in 8th Grade. I'm so glad my mom talked me out of wearing a trench-coat to the dance."

"Ah shit, I thought I deleted all this terrible fan-fiction from my chuuni phase. I can't believe I wrote 4933 words about Shadow the Hedgehog fighting Goku in Middle Earth."

"Oh god, not another chuuni little kid who thinks his music video about Sephiroth killing Aeris set to an Evanescence song is the pinnacle of art."

chuuni by defenestrator9001 August 8, 2016

Chuuni Samma 

Generally refers to one that acts feminine and like a huge weeb. They watch anime and even hentai and love to roleplay. Most males that are described as this are femboys/traps and normally part of the LGBTQ+ community.

See that Chuuni Samma over there, total cutie.

Chuuni Samma by Nagito Komaeda 15464 January 5, 2021

chuurilla 

chuurilla is a 12 yrl fan page who is racist.

“did you hear about chuurilla getting exposed?”

“yes, she deleted her account”

chuurilla by chuuslvr January 1, 2021

Chuurilla 

Racist “k-pop fan” who doesn’t deserve a platform.

blm. It’s not a joke, yeah I’m talking to you Chuurilla

Chuurilla by user82728293939 January 2, 2021

Chuurilla 

A racist 12 year old that had 40k, that's used kpop for clout

I said what I said Chuurilla

Chuurilla by park.jimin6 January 3, 2021

chuurilla 

a bhussyo who cant take backlash, so she deleted her account. a solid piece of evidence on why we shouldn’t idolise 12 year old fan pages. stop sending her death threats tho.

did you see that “chuurilla” deleted her account? that girl cant take backlash.

chuurilla by makskdkkskxkxd January 2, 2021

Chuunibyou 

A Japanese slang term which roughly translates to "Middle School 2nd Year Syndrome". People with chuunibyou either act like a know-it-all adult and look down on real ones, or believe they have special powers unlike others.

This is a common stage in growth; for most people, it happens--you guessed it--around the 2nd year of middle school (Grade 8 in Japan). However, the problem is, there are some grown-ups who have this symptom.
There are 3 main types of Chuunibyou. DQN-type pretends to be antisocial even though they aren't, or can't be and has made-up stories about antisocial behavior. Subculture-type prefers subculture or minor trends just to be different and have the "cool" factor. Evil Eye-Type admires mystical powers and pretends to have one of their own, to the extent of establishing an alias just for that.
And if you think you have one of these or want more information in the subject, a good idea is to read the "Chuunibyou User Manual" (中二病取扱説明書, Chuunibyou Toriatsukai Setsumei Sho) by Saegami HYŌYA.

If you tl;dr I'm going to clobber you.

An example of DQN Chuunibyou:
"Look at all those bandages wrapped around you! What happened?"
"I had a bunch of gang fights."
"Come on, I know you're too kind to be a gangster."

An example of Subculture Chuunibyou:
"When I collect Pokémon cards, I only collect ones that are imported from Japan."
"Can you read all those?"
"-_-; S-sure I can..."

An example of Evil Eye Chuunibyou:
"Don't take that bandana off my left wrist. It's sealing an evil spirit inside me and if you take it off I may go berserk."
"Dude, calm down. You just have chuunibyou."

Chuunibyou by cutesy pastel living doll August 7, 2012