How to Say "Inside Joke" in Japanese

内輪ネタ

uchiwa neta

The Japanese phrase for "inside joke" is 内輪ネタ (uchiwa neta).

内輪ネタ is used to describe humor or topics that are only understandable to a specific group, often implying that outsiders will be left out.

Is there a formal and an informal way to say it?

The phrase is colloquial and is frequently used in internet slang, comedy and casual social settings.

uchiwa neta

The word ネタ (neta) comes from the sushi world, where it refers to the topping on the rice. In the context of jokes, it evolved to mean the 'material' or 'ingredient' used to build a comedic bit.
While 内輪ネタ describes the joke, the act of excluding others through such humor is sometimes linked to the cultural concept of soto and uchi, meaning 'outside' and 'inside'.
On Japanese social media, users sometimes warn others about 内輪ネタ by using hashtags. This alerts strangers that the following content may be incomprehensible without specific prior knowledge of a fandom or group.

それは内輪ネタだ。
It's an inside joke.
This sentence shows how to identify something as 内輪ネタ.
Tatoeba #930154 by ryanwhiting, translation #930056 by U2FS
私たちの内輪のジョークを理解できるでしょうか？
Do you think you can understand our inside joke?
もし私たちの内輪のユーモアが理解できたら、きっと楽しい時間になりますよ。
If you can understand our inside humor, it will definitely be a fun time.
そのネタはお互いに共有しているから、もう何年も笑っているんですよ。
We've been laughing for years because we share that inside joke.
これは内輪ネタすぎて、みんなついてこれないよ。
Kore wa uchiwa neta sugite, minna tsuite kore nai yo.
This is too much of an inside joke, so no one can keep up.
その話は内輪ネタだから、ここでは言わないほうがいいよ。
Sono hanashi wa uchiwa neta dakara, koko de wa iwanai hou ga ii yo.
That story is an inside joke, so it's better not to say it here.

Misaki and Hiroto are at a party with many strangers.

美咲 Misaki

大翔くん、さっきの話は内輪ネタだった？
Hiroto-kun, sakki no hanashi wa uchiwa neta datta?
Hiroto, was that story just an inside joke?
大翔 Hiroto

うん、ごめん。ちょっと内輪ネタすぎたね。
Un, gomen. Chotto uchiwa neta sugita ne.
Yeah, sorry. It was a bit too much of an inside joke.
美咲 Misaki

周りの人が全然笑ってなかったよ。
Mawari no hito ga zenzen waratte nakatta yo.
The people around us weren't laughing at all.
大翔 Hiroto

次はもっと誰にでもわかる話をしよう。
Tsugi wa motto dare ni demo wakaru hanashi o shiyou.
Next time, I'll tell a story that everyone can understand.

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