What it means
セロ活 combines セロトニン (serotonin) and 活動 (activity). In youth-trend coverage, it describes restorative activities such as walking, reading, going to a movie, visiting a sauna, or having a quiet morning with friends. It is a lifestyle label for ways people hope to feel calmer or refreshed, not a scientific claim that an activity raises serotonin.
How to use it
Use it casually for an activity you choose to unwind or reset: 散歩でセロ活する (do a little “serokatsu” with a walk). The term can cover offline time away from social media, but it does not require going screen-free. It is a recent trend word, so explain it if your listener has not seen it.
Examples in conversation
Where it comes from
The word is formed from セロトニン (serotonin) and 活, a clipping of 活動 (activity). SHIBUYA109 lab. described it as a 2026 first-half youth-trend keyword for activities intended to bring calm, clarity, or balance, with examples including walking, reading, movies, saunas, and spending time with friends. The term uses wellness language loosely; it does not establish a medical effect.
Related slang
Further reading
We use references to check meaning and background. Examples on this page are original.