What is the definition of Paying Fluid?

A "paying fluid" is like a sly little cash-stealer, but instead of a wallet, it's a vial of liquid gold (or silver) used in the most bizarre ways to pay for services. It's like when you accidentally spill coffee on a date and the only thing you can think of to pay for dinner is your own blood, but much more discreet.

---

Here's an edgy example sentence: "The con artist asked for 'paying fluid' to get my secret recipe for the world's most addictive jam, and I just had to say, 'That's more like 'ecret ingredient'."