What is the definition of Suggests Blood Cells?

"'Suggests blood cells' is like saying a comedian thinks the next big medical breakthrough is a blood type match, but instead of punchlines, we get platelets doing cartwheels."

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And here's an unsettling example sentence: "The detective, after years of studying criminology and biology, suddenly suggested that the killer's favorite color was 'uggesting blood cells'—a crimson whisper in the dark, suggesting an impending vampire apocalypse."