蛙かえるの面つらに小しょう便べん

expression

like water off a duck's back

Idiomatic expression meaning that criticism or scolding has no effect on someone, just as urine on a frog's face would not bother it. Colloquial and somewhat vulgar due to the word 小便.

See also: 蛙の面に水

• あいつに何なにを言いっても蛙かえるの面つらに小しょう便べんだよ。

  No matter what you say to that guy, it's like water off a duck's back.

• 注ちゅう意いしても蛙かえるの面つらに小しょう便べんで、全ぜん然ぜん聞きいていない。

  Even if you warn him, it's like water off a duck's back; he doesn't listen at all.