Lascar literally means 'to crack' or 'to chip', but in Brazilian Portuguese, especially in informal contexts, it's often used to mean 'to break' or 'to hurt deeply', particularly when referring to emotions or the heart.
In the song, the phrase "É pra lascar o coração" translates to "It's enough to break the heart" or "It's heartbreaking." It's a strong, colloquial expression that conveys intense emotional pain, making it a memorable and impactful word in the context of a breakup.
This song is structured as an open letter to a failing relationship, and it's absolutely devastating. Mari Fernandez starts by saying she's writing with a broken heart, where "Cada letra que eu escrevo / Parece que dói mais que um tiro" (Every letter I write / Seems to hurt more than a gunshot). She's confronting a lover who made huge promises but didn't keep them, and now she can't figure out how to let go.
The central question of the song is just heartbreakingly direct: "Como é que eu vou dizer adeus? / Pra pessoa que eu pedi pra deus" (How am I going to say goodbye? / To the person I asked God for). She feels this person was her destiny, an answered prayer, which makes the breakup feel impossible. Instead of accepting the end, she begs them, "por favor não vai embora" (please don't go away), admitting she doesn't have the courage to say goodbye. It's a powerful look at someone who is completely stuck in the pain of a breakup.