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A rhetorical gambit used to instantly dismiss an argument, line of questioning, or piece of evidence by labeling it a "conspiracy theory," regardless of its factual basis or the reasonableness of the inquiry. This card is played to associate the speaker with the most irrational and lurid examples of conspiracy thinking (like flat Earth or lizard people), thereby poisoning the well, shutting down debate, and protecting the accused institution or narrative from scrutiny. It's a thought-terminating cliché.
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