Lastimar means "to hurt" or "to harm." While it might seem like a common word, its repeated use in the song's title and chorus, "Tú me quieres lastimar" (You want to hurt me), makes it particularly impactful and central to the song's emotional core.
It captures the raw pain and betrayal felt by the singer, who is being stood up on his birthday. The word perfectly encapsulates the feeling of being intentionally wounded by someone you love, making it a powerful and memorable choice for this dramatic ballad.
Ladrón open with a phone call, not a guitar riff. A woman calls to bail on her boyfriend's birthday dinner because a friend just landed from Puebla, and he spends the rest of the song working out how to feel about it. It is not a breakup song so much as one broken promise turning into a chorus.
He tries reasoning it out first ("Mejor vamos a unirnos" [we'd do better to come together]) before giving up and landing on the title line, "Tú me quieres lastimar" [you want to hurt me], repeated until it stops sounding like an accusation and starts sounding like a diagnosis. Midway through, the phone rings again and she cancels a second time with the same excuse ("ya te dije que no voy a poder ir" [I already told you I can't make it]). By the last chorus he has stopped asking her to change her mind. He's just saying the line.