duck's guts

noun[plural only]2

1. •
   (Australia, informal) Something superlative, something outstanding.

   • A line of stationary engines, knocked up between the wars in the wheat-belt town of Wagin, is just about the duck's guts of collectibles, so far as he is concerned. — 2002
2. •
   (slang) A difficult or awkward situation, trouble.

   • De cuntry in duck’s guts and wunna heah polemicizing bout how we must elect a former lady of the night cause she got potential — 2018