Definition of "newsflash"

newsflash

noun
plural newsflashes
1. (broadcasting) A brief media report of something that has recently taken place.
interjection
1. (colloquial, often sarcastic) Introduces an obvious fact of which the person addressed is ostensibly not aware.
  Quotations
  In the 1980s we thought that fat was the root of all evil, but now people are saying that insulin is what is making us fat or that we should eat paleo, like our prehistoric friends (um, newsflash: most people in the Paleolithic era died from starvation).
  2019, Rob Lipsett, The Rob Lipsett Game Plan