What is the definition of Mainstream Fumes?

"Mainstream fumes" is a phrase that humorously describes the noxious, yet ubiquitous, byproducts of our daily lives – think of it as the collective, unapologetic, and slightly toxic breath of the average Joe or Jeeeeee. It's like those perpetual, pungent bubbles that seem to cling to every surface, from traffic jams to grocery store aisles, just waiting to give us a headache.

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Here's an unsettling example sentence: "The mainstream fumes from the city's endless smog painted my morning commute into a masterclass in existential dread."