A teen social media star has been brutally shot dead while partying at a nightclub after mockingly telling a notorious Mexican drug lord to perform a sex act on him.

Juan Luis Lagunas Rosales - who goes by the alias 'the Pirate of Culiacán' on his wildly successful YouTube and Instagram profiles - was shot more than a dozen times by members of Jalisco Nueva Generación, Mexico's fastest-growing cartel.

His death came less than month after the 17-year-old was filmed telling Nemesio 'El Mencho' Oseguera Cervantes, the cartel's leader, to "suck my dick".