noun, masculine/ˈbulo/plural: bulos
canard, hoax (false or misleading report or story, especially if deliberately so)
“2015, Eva Aladro Vico, Graciela Padilla Castillo, Aplicaciones actuales de la comunicación e interacción digitales, ACCI (Asoc. Cultural y Científica Iberoameric.), page 426” — (please add an English translation of this quotation)
Synonyms: filfa, hoax
Perhaps from Caló bul (“crap, nonsense”).