箱はこ乗のり

noun

leaning out of a car or train window

Refers to the act of sticking one's upper body out of a vehicle window, often associated with a sense of freedom or recklessness.

• 彼かれは電でん車しゃの窓まどから箱はこ乗のりをして風かぜを感かんじていた。

  He was leaning out of the train window, feeling the wind.

• 箱はこ乗のりは危き険けんなのでやめましょう。

  Leaning out of the window is dangerous, so let's not do it.