What is the definition of Pretty Fluid?

"Sure, let's dive into the whimsical world of 'pretty fluid.' Imagine a liquid that's as adaptable as a cat's mood after watching too many cat memes - it morphs from thick, syrupy puddle to thin, watery stream in a heartbeat. It's like trying to explain your cat's mood to a toddler who just learned to tie shoes."

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Now, here's an unsettling example sentence: "The 'pretty fluid' liquid in the abandoned laboratory morphed from a solid block of horror into a gelatinous blob that resembled someone's deepest nightmares, causing the scientists to question whether they should have just taken a nap."