小こ間ま物もの屋やを開ひらく

expression, godan verb (-ku)

vomit; throw up; spew

Jocular, colloquial expression literally meaning 'to open a haberdashery', playing on the sound of vomiting.

• 飲のみすぎて、トイレで小こ間ま物もの屋やを開ひらいちゃった。

  I drank too much and ended up throwing up in the toilet.