What is the definition of Mainstream Fluid?

A 'ainstream fluid' is like the unassuming, everyday water we all drink - the kind that doesn't quite sparkle but does the job. It's the unremarkable, ubiquitous stuff that keeps us hydrated, but in a way that's as boring as a boring coffee shop. It's the silent stream of societal norms, the unspoken rules that everyone else seems to follow without a second thought.

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Here's an edgy example sentence using it: "Despite the avant-garde fashion of the underground, the mainstream fluid remained a monotonous grey jug, unchallenged by anyone's revolutionary splash of color."