"Cumbia Pandillera" is Santa Fe Klan throwing a block party and daring you not to dance. He opens by shouting out his home turf, "Y desde Guanajuato, Capital" (and from Guanajuato, the capital), and promises music "pa' que to' el barrio se ponga a bailar" (so the whole neighbourhood starts dancing). The beat is cumbia, the attitude is street rap, and the title literally means "gang cumbia".
The chorus is a cheeky self-portrait: "Siempre resultan ser los malandros de las fiestas" (they always turn out to be the troublemakers of the party). Malandro is Mexican slang for a thug or hoodlum, and he wears it proudly, adding "Somos los malandros que siempre han criticado" (we're the hoodlums people have always criticised). He even tells off the haters: "Báilale, si tú no eres un amargado" (dance to it, if you're not a sourpuss).
Listen for the slang. Tirando el placazo means showing off your crew's sign, rolando is cruising around, and la vida chueca (the crooked life) is the street life he toasts "cerveza tras cerveza" (beer after beer). By the last verse it is a full neighbourhood scene, with "el don bailando con su doña" (the old man dancing with his wife) and the kids jumping around. It is loud, a bit rowdy, and hard to sit still through.