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メンヘラ menhera
Emotionally clingy, and knows it.
What does menhera mean?
Someone who runs hot on feelings and attachment. Most often used about oneself, with a small self-aware laugh, so it lands softest that way.
Example
既読が遅いだけで不安になる、自称メンヘラです。
I get anxious over a slow reply — self-declared clingy type.
Vibe
Who you can say this to, and how it lands.
Be careful This one carries weight. Read the meaning and the story before you say it to anyone.
About yourself this usually passes as a joke. Aimed at someone else it is an insult.
The story behind menhera
The origin is unusually traceable. Japan's big message boards had a mental health section, メンタルヘルス板, and its regulars were nicknamed メンヘラー, then shortened to メンヘラ in the late 2000s. The word left the board and kept going, which is how a term for a forum population became a term for a personality.
That history is worth knowing, because it explains why the word can cut. Aimed at somebody else it can be genuinely cruel, and a whole aesthetic, all pastel and self-aware sadness, has grown up around it too. Aimed at yourself, with a laugh, after checking whether a reply has arrived nine times, it is something much softer.