noun
lamestream media; mainstream media (derogatory)
Slang pun blending カス (dregs, trash) and マスコミ (mass media). Used jocularly or derogatorily to dismiss mainstream media as worthless.
ネットではよくカスゴミって書かれてるよね。
You often see 'lamestream media' written online, don't you?
あの記事はカスゴミの典型だ。
That article is a typical example of lamestream media.