kòu shǐ kuī zi
(northern dialect) lit. to cap in excrement
fig. to discredit with absurd unfounded accusations; to vilify
扣
kòu
button
屎
shǐ
feces; excrement; a stool
盔
kuī
helmet
子
zi
noun suffix, as in 椅子[yi3 zi5] "chair"
