What is the definition of Contacted Blood Cells?

"Contacted blood cells, my friend, are like the universe's superheroes who just show up in the bloodstream to save the day. But let's not get too sentimental - they're usually just looking for a nice cup of coffee to recharge. Now, here's an unsettling example: 'The detective contacted the blood cells, only to find out they had a vendetta against the local coffee shop, which happens to be the epicenter of their secret identity as 'The Coffee Ghost.'"