Definition
The phenomenon where physicists feel compelled to re-explain concepts to fellow physics-knowledgeable people, because obviously their interpretation of quantum mechanics is the only correct one. It's mansplaining's nerdy cousin, except instead of gender dynamics, it's fueled by an unshakeable belief that their PhD makes them the sole keeper of scientific truth. The accuracy of the original explanation is irrelevant—what matters is asserting intellectual dominance.
Example Usage
Even though Sarah has a doctorate in astrophysics, her colleague couldn't resist physicistplaining black holes to her at the conference.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=physicistplaining&defid=16828462)
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