What is the definition of Watershed Fumes?

"Watershed fumes" is a delightfully absurd term that humorously describes the noxious, yet oddly refreshing, odor released by a particularly potent mixture of rainwater and human excrement, as if nature's way of saying, 'Hey, we've got a toxic waste spill on the horizon!'

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Here's an unsettling example sentence: "The ethereal aroma of 'watershed fumes' wafted through the valley, a morbid testament to the town's latest environmental disaster, making the once serene lake look like a neon-lit graveyard on a drizzly day."