頭あたまが変へん

expression, na-adjective

crazy; insane; out of one's mind

Colloquial expression meaning someone is mentally unstable or acting irrationally. Often used in casual conversation.

• あんなことを言いうなんて、彼かれは頭あたまが変へんだ。

  Saying something like that, he must be crazy.

• 徹てつ夜やが続つづくと頭あたまが変へんになりそう。

  After staying up all night for days, I feel like I'm losing my mind.