開洋葷

Simplified: 开洋荤

kāiyánghūn ㄎㄞ ㄧㄤˊ ㄏㄨㄣ

    • to try something foreign or new for the first time
    • to have a novel experience

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
eat foreign meat for the first time
Meaning
To try something foreign or entirely new for the first time, or to have a novel experience. Light, humorous.

Sources