狗吃屎

gǒuchīshǐ ㄍㄡˇ ㄔ ㄕˇ

    • to fall flat on one's face (vulgar)

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

May offend: vulgar language

Literally
a dog eating excrement
Meaning
Either falling flat on your face, or an ingrained bad habit. Coarse.

Sources