Lacras literally translates to "scum" or "parasites." It's a strong and somewhat aggressive term not commonly found in everyday conversation or many songs.
In the context of this song, it refers to people who only appear when things are going well, highlighting the theme of distinguishing true friends from opportunistic individuals. The line "Sobran amistades, sobran lacras" (There are plenty of friends, plenty of scum) powerfully conveys the idea of fair-weather friends.
Ever wondered where people were when you were struggling? In "Donde Andaban," which translates to "Where Were You," Los Gemelos De Sinaloa and Herencia de Patrones explore this very question. The song is a powerful statement about their journey from having nothing to achieving great success. They call out the fake friends and fair-weather supporters who only showed up after the money and fame arrived, asking, "donde andaban cuando faltaba la lana" (where were you when the money was missing?).
The lyrics paint a vivid picture of overcoming hardship through self-reliance and hard work. They recall a time when "la gente se burlaba del morro" (people made fun of the kid), but now that kid has everything. It's a story of betting on yourself when no one else would, picking yourself up after every fall, and proving everyone wrong. The song celebrates their success, acknowledging that it "no sucede de noche a la mañana" (doesn't happen overnight) and was earned through struggle and perseverance.