urban legend

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noun
  1. a modern story of obscure origin and with little or no supporting evidence that spreads spontaneously in varying forms and often has elements of humor, moralizing, or horror: Are there alligators living in the New York City sewer system, or is that just an urban legend?

Origin of urban legend

First recorded in 1970–75
Also called urban myth.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018