What is the definition of Periods Blood Cells?

"Periods blood cells: These little red, white, and sometimes yellow warriors are basically the body's own personal time-traveling assassins, but instead of stealing money from banks, they sneak into your bloodstream, causing you to feel like you're living in a time warp where every heartbeat is a flashback to your past self's awkwardest day."

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Example sentence: "I can't believe I'm still stuck in periods blood cell mode - they're literally the superheroes of my reproductive system, saving me from becoming a zombie apocalypse of an older woman!"