What is the definition of Instructors Fumes?

Instructors fumes are like the stale coffee of a university lecture hall, but way more potent and with a side of existential dread. They're the invisible, noxious cocktail that permeates the air when professors are trying to teach you complex theories about quantum physics or existentialism.

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Here's an unsettling example: "When Professor Bubbleworth, who claimed to be an expert on the art of fuming, announced his latest lecture on 'The Science of Scent,' the room erupted in panic - literally, with a few students covering their noses and muttering 'fumes' like they just found out they were being poisoned by a secret government experiment."