come a gutser

verb2

1. •
   (Australia, slang) To do a belly flop; to fall flat on one's face.

   • Slippery as a butcher's apron it is, and I comes a gutser twice before I gets down to the stag. — 1964
2. •
   (Australia, slang) To fail miserably; to make a huge mistake; to fall flat on one's face.

   • Ole Fritz keeps on tryin' ter feel our possies at night with small patrols, an' they tried ter raid us two nights ago, but came a gutser, 'coz we hopped out an' met 'em, an' they put their 'ands up. — 1919