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Used as noun, verb, adjective or honorific: a pejorative term describing an individual (usually on the fringes of a friendship group) who generally (and often unintentionally) ignores usual social protocol. Their actions and behavior are often described as "creepy", "overly friendly" or "overly tactile". Derived from the 'slender man' internet mythos; a tall, human-like monster who allegedly skulks around silently, stalking individuals and stealing small children.
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