磨嘴皮子

mózuǐpízi ㄇㄛˊ ㄗㄨㄟˇ ㄆㄧˊ ˙ㄗ

    • to wear out the skin of one's teeth (idiom) pointlessly blather
    • to talk incessant nonsense
    • blah blah

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
grind the lips
Meaning
Chatter or talk endlessly, often to no purpose. Mildly disparaging.

Sources