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japanese house arrest 

The act of staying indoors and never leaving your house, especially to play video games all day. Usually describes the condition of gamers or those who follow the hikikomori lifestyle outside of Japan
Yo why does Joe never go out? He’s always at home playing GTA
Idk man he’s under Japanese house arrest

He needs to touch grass

japananas 

a japanese pineapple (ananas is Dutch for pineapple)
hey I have a problem
what is it?
I want a pineapple but also go to Japan. I don't know what to do anymore. I'm freaking out!
Dude, chillaxxxxx! Take a Japananas and all your problems are solved.
japananas by Japananas January 17, 2015

japanese lunch time rush 

The most famous line of the character from Kuroko's Basketball, Kagami Taiga. It's when people in japan tend to all rush and flock in a food establishment (in the anime's case, the school cafeteria) because the japanese only have a 30 minute lunch break. That sucks.
"Woah! Look at all those Japanese people going crazy for that special sandwich. THIS IS JAPANESE LUNCH TIME RUSH!"

Japan is attacking 

When a girl is in public or too embarrassed to say this is a common code for "I'm on my period". It is symbolized by Japan's flag being white with a red dot, or period, on it.
Hannah: Japan is attacking, full force
Holly: Do you have the ammunition?
Hannah: We're running low
Holly: *slides tampon or pad into Hannah's hand*

Japanese Dog

Noun. To yank someone's collar or, preferably tie, violently back and forth while yelling "are you a Japanese dog?". This will no doubt cause them to snarl angrily, much like a Japanese dog would if you jerked their collar back and forth. Giving someone a Japanese dog is frequently considered a merse.
Marshall totally gave Christian a Japanese dog before his Spanish presentation. Christian had to stand in front of the whole class with his tie fucked up!
Japanese Dog by ehuzzie October 25, 2018

Sea of Japan 

A misnomer endorsed by the Japanese government itself and supported by the majority of the gullible and uneducated population of Japan with no regards to history whatsoever.
The Japanese think that the so called "sea of japan" is the body of water between S.Korea and Japan. However, that body of water has been called the East Sea (in relation to Korea) for over 2000 years and represented in maps both in Europe as well as Japan as the EAST SEA.
Dumb Avg. Jap: Herro, i gous pishin to da shea of japaaaan!!!

Rare, educated Jap: What you idiot?

Dumb Avg. Jap: Da see of japan raer i goin pish!

Rare, educated Jap: You're a fool. The "Sea of Japan" is non existent. It's made up by our incompetent, dumb government. It's been called the East Sea for 2000 years and recorded on European maps as the East Sea since the 16th cent. People like you are the reason why our population as a whole is regarded to be dumb and ignorant.

Dumb Avg. Jap: Noooooooouuu! Eberybady call it da Shea of Japan! Japanesh Wocks!!

Rare, educated Jap: smh, smh.
Sea of Japan by unbiasedguyyy July 30, 2010
More from Urban Dictionary
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
Literally "dirty" pronounced with a West Indian accent. Can also have a positive connotation, for example Sean Paul's album title "Dutty Rock".
"The girl is pretty but she corrupt and dutty!"

or, in a positive usage:

"Booya! That freestyle was dutty!"
Dutty by J Hall April 3, 2003
Word of the Day on October 1, 2026
korean word for madam, older woman
Ajumma wait a moment
Ajumma by aintnotinbutnice July 5, 2009
Word of the Day on September 30, 2026

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
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