Wiktionary
brass-balled
a. (context slang English) courageous, brave
Usage examples of "brass-balled".
Juggling figures was also the best way to pick up the trail of employee theft, dishonest dealers, and the occasional brass-balled hacker.
When we fired the last one—there was a brass-balled bitch if ever there was one—and we got Gina, it was like someone cracked the gate of heaven just enough for an angel to slip through, only the stupid thing tripped over its own gold-sandaled feet and when it fell to earth it landed on its head.