頭あたまがどうかしている

expression, ichidan verb

to be crazy; to be mad; to have a screw loose

Colloquial expression used to say someone is acting irrationally or out of their mind. Often used in a light or exasperated tone.

• こんな時じ間かんに外そとで叫さけぶなんて、頭あたまがどうかしてるよ。

  Yelling outside at this hour—he must be crazy.

• あんな危あぶない橋はしを渡わたるなんて、頭あたまがどうかしてるんじゃないか。

  Crossing such a dangerous bridge—are you out of your mind?