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あるある aruaru
So relatable. Classic.
What does aruaru mean?
The yep-that-happens genre. Every group, job and country has its own list, and comedians live off them.
Example
それ、日本の電車あるあるだね。
That's a classic Japanese train thing.
Vibe
Who you can say this to, and how it lands.
Safe to use Fine in ordinary conversation.
The story behind aruaru
あるある is just よくあること, the everyday phrase for that happens a lot, worn down into a two-beat chant. Its real home is comedy: the あるあるネタ, where a performer lists the tiny universal details of school, office life or convenience stores, and the audience laughs because they have been caught. Television variety shows built entire segments on the format, and it has never really gone away.
Social media then handed the genre to everybody. Nobody needs a stage to post 電車あるある or 一人暮らしあるある, and short video made the format even faster. The best ones are never big observations. They are the specific, slightly embarrassing thing you thought only you did.