What is the definition of Hills Blood Cells?

"Hills blood cells"? Well, imagine a blood cell that's so rugged and mountain-climbing it could probably give you a workout in its own right! It's like having a tiny, fast-talking mountain goat in your bloodstream. They're toughened up to withstand the pounding of those steep hills, and if they get too tired, they might just decide to make a new trail - one that's more like a riverbed than a road.

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Here's an edgy sentence using this whimsical term: "The detective couldn't shake the chilling thought that the missing jewel in the case, the 'hills blood cells' of the victim, had somehow escaped detection because they were too hard to find in the first place."