Descaro translates to "shamelessness" or "impudence". It's a strong word used to describe a bold, disrespectful attitude or action, often implying a lack of modesty or a brazen defiance of what is proper.
In the song, Lefty Sm uses it when he sings, "Que no me interesa su pinche descaro" (I'm not interested in your damn shamelessness). This highlights his defiant and unapologetic persona, dismissing any criticism or negative judgment from others with a powerful and direct term.
If you want pure defiance wrapped in heavy Mexican street rap, this is it. Lefty Sm lays it all out right in the chorus: "Otra vez ando volando, traigo una pinche loquera" [Once again I'm flying high, I've got a crazy buzz going] and "porque pura madre cambio" [because no way in hell am I changing]. He is proud of where he comes from, shouting out his hometown and area code with "Soy de Sonora, del Río Colorado / 6-5-3, represento mi estado" [I'm from Sonora, San Luis Río Colorado / 6-5-3, I represent my state]. There is zero desire to please critics or play nice with fake friends who whisper behind his back. When people gossip about his life or wonder if he is smoking weed, he laughs it off, saying they act like nosy cops: "Parece que son policías" [It seems like they're police officers].
What makes the track stick is the blunt regional slang Lefty fires off. He leans on his trusted crew ("toda mi clica que me hace el paro" [my whole crew that has my back]), where hacer el paro means helping out or backing someone up. He tells rivals straight up that he will never wave a white flag ("pura madre bajo bandera" [no damn way do I surrender]). My favorite bit of humor comes near the end when he brushes off all the noise with "Siempre para delante, nunca pasos de cangrejo" [Always moving forward, never crab steps backward]. It is loud, stubborn, and completely honest about who he is: covered in tattoos ("todo bien rayado" [all inked up]) and refusing to take a single step in reverse.