What is the definition of Roommates Fluid?

Let's break down 'roommates fluid' like we're dissecting a bizarre cosmic entity. Imagine two roommates who are, on a cosmic scale, more interchangeable than a Rubik's cube in a slumber party. They can swap beds without any fanfare, share the same bathroom like it's a high-tech vacuum cleaner with a 24/7 cleaning schedule, and their personalities can morph from the chilliest zen master to the most heated debate starter in a decade, all without ever saying "no" or "me too."

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Now, here's an edgy example sentence using this cosmic concept: "In the roommates fluid of our existential crisis, we decided to upcycle our old couch into a 'elf-help' book, complete with 'roommate harmony' and 'bedtime stories' for our imaginary ghost."