purple patch

noun2

1. •
   A period of excellent performance where nearly everything seems to go right, contrasting with a lower general level of performance.

   • He came with a disconcerting black-eye that he wouldn’t explain. “Not so much a black-eye,” he said, “as the aftermath of a purple patch.... What’s your difficulty?” — 1908
2. •
   An ornate or elaborate section of a written work; a patch of purple prose.

   • To the picket Private Copper held forth for ten minutes on the life-history of his captive. Allowing for some purple patches, it was an absolute fair rendering. — 1904