a combination of shit + trash, referring to the worst content on the web (articles, news pieces, videos, etc. and all formats and media types in content); containing horrifically written, spelled, or utterly low-quality, garbage content.
Content pieces that should not see the light of day, but instead get widely published on a mainstream website.
That content is straight-up shash.
We're not publishing that shash.
Sorry, your shash has been rejected.