屁へをこく

expression, godan verb (-ku)

fart; break wind

Colloquial and somewhat crude expression for passing gas. Often used in casual or vulgar contexts.

• 誰だれか屁へをこいた？

  Did someone fart?

• 電でん車しゃの中なかで屁へをこくのはやめてほしい。

  I wish people wouldn't fart on the train.