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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
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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."

Chuning Choke 

While giving a blow job, the man rams his dick too far down the women's throat, causing her to vomit all over the male's dick.
"Did you hear about Laura last night? She Chuning Choked!"
"Oh man! That must of been messy for Johnny!"
Chuning Choke by Tacobutt June 10, 2014

Churning butter

When a woman is rides a man reverse cowgirl; he grabs her by her neck and hair; and loops her up and down in a circlular motion on his cock.
I was churning butter so hard last night she can't walk right.
Churning butter by Sambubs May 31, 2018

chuuwing.gum 

chuuwing.gum is a famous kpop fanpage on tiktok for stanning loona and "listening to sweater weather"
Loona stan:did you see chuuwing.gum new video?
Other loona stan:YES! I did.

Churning Up Pollution 

This is when you are experiencing serious coughing fits and you spit a lot when you cough. These extreme coughing spells usually occur when you have a bad cold, the flu, etc.
Last night I was churning up pollution so much, so I finally had to take some Nyquil.
Churning Up Pollution by Ryan J. February 14, 2005

chuuinred 

@chuuinred is a famous tiktok kpop fanpage .

How do I say this, she's kind and when I tag her she always responds, probably not like the other fanpages
follow chuuinred on tiktok
chuuinred by dahyeoun December 21, 2020