Drug trafficker in spanish. Someone who smuggles and distributes drugs from/into the US from Mexico or other Latin America countries.
I come on the front of the Narco Trafficante I get to telling them motherfuckers "Yo mato por nada" They like "What that mean?" I had to tell em', that mean I kill for nothin. - Kevin Gates
Corrido stands for ballad, and narco, of course, involve drugs.
Kind of gangstarap alla mexicana, wich means that in fact it's 'gangstamariachi'.
The songs, based on polkas and waltzes, feature lyrics backed by accordions and brass bands.
Narco corridos, had spread to California, Texas, Nevada, Florida and other places with large Hispanic populations (Colombia, El Salvador, etc).
Rosalino "Chalino" Sanchez is the Tupac of narco corrido.
See CSI Vegas, ep 512.