птичье молоко

Literally, “birds’ milk”.

• IPA^(key): [ˈptʲit͡ɕjə məɫɐˈko]

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пти́чье молоко́ • (ptíčʹje molokó) n inan (genitive пти́чьего молока́, uncountable)

1. hen’s teeth (something extremely rare)
2. (also capitalised) "Ptichye moloko", (name of) popular chocolate candies, also known in the West under the Polish name ptasie mleczko (“birds’ milk”), and in Germany as Vogelmilch (“birds’ milk”).