urban legend
US /ˌɝː.bən ˈledʒ.ənd/
UK /ˌɝː.bən ˈledʒ.ənd/

1.
lenda urbana, mito urbano
a humorous or horrific story or piece of information circulated as though true, especially one that is widely disseminated orally.
:
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The story about alligators in the sewers is a classic urban legend.
A história sobre jacarés nos esgotos é uma clássica lenda urbana.
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Many people still believe that urban legend about the vanishing hitchhiker.
Muitas pessoas ainda acreditam nessa lenda urbana sobre o caroneiro que desaparece.