もらいゲロ

noun, noun or participle which takes 'suru', intransitive verb

sympathy vomiting; vomiting triggered by seeing or smelling vomit

Slang term for vomiting induced by the sight or smell of someone else's vomit. Often used in casual, humorous, or gross-out contexts.

• 友とも達だちが吐はいたのを見みて、もらいゲロしそうになった。

  I almost sympathy-vomited after seeing my friend throw up.

• あの臭くさいで、もらいゲロする人ひともいるらしい。

  Apparently some people sympathy-vomit from that smell.