Rompecorazones literally translates to "heartbreaker". It's a vivid and engaging compound word that immediately paints a picture.
In the context of the song, Lali uses it to describe herself, warning a potential lover not to fall too deeply for her because she's a "rompecorazones." This self-aware and playful use of the word makes it particularly enticing and memorable, hinting at a fun, yet potentially complicated, dynamic.
Lali sings about the pull she has over someone who can't help falling for her. She's noticed the attraction is one-sided at first, he's clearly into her more than she let on, and once they get close, she overwhelms him: he loses focus, can't control himself, can't pull away.
The chorus names that hold directly. "Lo que tengo yo" ("what I've got") heats him up, controls him, overwhelms him, makes him fall for her. But she's upfront about what this is: tone down the love, lower your expectations, this is just for fun. She's warning him not to fall for a heartbreaker, even as she's the one causing the trouble.
It's a playful, confident song about owning her own magnetism while being honest that she isn't looking for anything serious.