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Originating as a joke featured in the TV series, Broad City, and referencing multiple scenes from the film, Black Swan, to Black-Swan someone is to stealthily approach an unsuspecting victim, esp. an acquaintance, from behind, wait silently from a short distance for the target to turn around, and to opportunistically startle them by standing motionless and displaying a batshit-intense, emotionless, I-watch-you-while-you-sleep, and unblinking stare.
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