What is referred to by this? Apparently, it's an operatic reference to the fourth part of Der Ring des Neibelungen, called Götterdämmerung, which ends with a twenty minute aria by Brunnhilde.
Brunnhilde is typically cast as a full-figured woman carrying a spear and shield, and wearing a DD- or larger-sized breastplate or sports bra and horned helmet. Because Der Ring des Neibelung seems to go on forever, it truly ain't over until the fat lady sings!
It's nice there is this unexpected link of sports with Germanic opera!
An air from another Wagnerian opera from the Ring cycle also made its appearance in an old war movie, Apocalypse Now: