Mañas refers to tricks, cunning habits, or street smarts. While it can literally mean "skills" or "bad habits" depending on the context, here it represents the unspoken rules of the hustle.
In this rags-to-riches song, the singer warns, "En el juego muchas mañas, uno tiene que estudiarle" (In the game there are many tricks, one has to study them). It is a fantastic vocabulary word that perfectly captures the gritty theme of needing sharp street smarts to survive and earn a "billete grande" (big bill).
"Billete Grande" is a gritty, boots-on-the-ground corrido about clawing your way out of poverty. Fuerza Regida and Edgardo Núñez immediately set the scene in Culiacán, Sinaloa, recounting a childhood of burning bare feet on the street and begging Saint Jude for relief while starving: "Caminando por la calle descalzo, los pies me arden / Le pedí a mi San Juditas mientras me aguantaba el hambre" ("Walking barefoot down the street, my feet burn / I prayed to my Saint Jude while holding back my hunger"). San Juditas (St. Jude Thaddeus) is the patron saint of hopeless causes, popular across Mexico among those facing desperate odds. Coming from nothing, the narrator decides to flip his luck because he wanted real wealth: "Le di vuelta la moneda, yo quería billete grande" ("I flipped the coin, I wanted big money / large bills").
The track stays blunt about the underworld game and its heavy tolls. The singer gives credit to a mentor named Don Roque and makes his underworld loyalties clear with the line "La cachucha puesta de los Guzmán Salazar" ("Wearing the cap of the Guzmán Salazar [family]"), signaling his alliance to that specific faction. But street success brings betrayal and violent losses. He warns that fake friends will guard the tricks of the trade, and he recalls an ambush in a Chevy Tahoe that took his sibling's life: "Los vergazos en la tajo, que mi hermano en paz descanse" ("The shootout / beatdown in the Tahoe, may my brother rest in peace"). Now the phone rings non-stop with business calls ("llamada a llamada va llegando al celular"), and there is zero looking back.