蛙の面に小便 or 蛙の面に水
2018.11.27 13:00
[kaeru-no-tsura-ni-shouben] or [kaeru-no-tsura-ni-mizu]
Literal translation:
Piss (water) on the face of a frog
Meaning:
(like) water off a duck's back (English idiom)
ineffective criticism or the like