Furnace + Ass. When the release of flatulence is incredibly hot, feeling as though it is roughly 10-20 degrees celsius hotter than the body temperature of the person releasing it. Typically, Furnass releases are completely silent and smell worse than anything the natural world can produce.

"Sorry, James, I have ridiculous Furnass right now."
"I know, Tyler. I've been smelling it for the last hour."

Furnass by He Who Has Smelled Furnass February 23, 2021

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