メンヘラ

noun

mentally unstable person; nutjob; lunatic

Internet slang, often derogatory. Refers to someone perceived as emotionally or mentally unstable, especially in online communities. Can be used self-deprecatingly.

• あの掲けい示じ板ばんにはメンヘラが多おおい。

  That forum is full of nutjobs.

• 彼かの女じょは自じ分ぶんをメンヘラだと言いっている。

  She calls herself a mental case.