The quantifiable level relating to how udderous a woman is.
Lying on my front, I glanced behind to see them pressing both their chests firmly into my back, which I knew would minimise the accuracy of any measurement taking. However, as they shifted onto their knees the overall force being transmitted lessened, leaving the inherent weight of their breasts as the only remaining downward force. It was at that moment of pure breast-related loading that I was able to precisely determine the overall levels of uddarity. These levels were the highest that I had then experienced, and due to the fact it had been several weeks since I had last stroked one off, I could not prevent myself from leaking a thick risotto-like love fluid - concluding the evening at once.