This is an aphorism from my aphorism book.
호랑이 더러 고기를 달란다
ho.rang.i deo.reo go.gi.reul dal.lan.da
tiger some meat-OBJ ask-for-PRES
[He] asks a tiger for some meat.
Which is to say, the asking of the impossible. I was puzzled by the word 더러, here. I surfed the dictionary for a while and decided it must mean something like “some” or “a bit of.” I’m not very confident of that, however.