打自己嘴巴

dǎzìjǐzuǐba ㄉㄚˇ ㄗˋ ㄐㄧˇ ㄗㄨㄟˇ ˙ㄅㄚ

    • to contradict oneself in what one says or does

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
slap one's own mouth
Meaning
To contradict oneself in what one says or does. Mocking or critical.

Sources