说梦话

Traditional (Taiwan): 說夢話

shuōmènghuà ㄕㄨㄛ ㄇㄥˋ ㄏㄨㄚˋ

    • to talk nonsense
    • to propose something impossible

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
talk in one's sleep
Meaning
To propose something that cannot possibly happen. Mocking.

Sources