What is the definition of Permitted Fluid?

A 'permitted fluid' is like a superhero cape for everyday substances - it's something that's allowed to flow freely, usually in a controlled environment. Picture this: "The permissible fluid flowed like a rainbow through the city's plumbing system, leaving no puddle of 'unforeseen' consequences in its wake."

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Now, here's an edgy example sentence: "The 'permitted fluid' decided to sneak into the CEO's private jet, promising to bring 'a refreshing change of scenery' and a side of cosmic horror."