Zapatero literally means "shoemaker" in Spanish. It's an interesting and somewhat unexpected word to find prominently featured in a reggaeton song.
In the context of Ivy Queen's lyrics, it's used in a clever play on words. The phrase "Zapatero, a tus zapatos" is a common Spanish idiom meaning "Shoemaker, to your shoes," which is similar to the English "Stick to your own business" or "Mind your own business." Ivy Queen uses this to tell off men who are trying to control her or underestimate her, asserting her independence and power.
Ivy Queen's "Zapatero" is a powerful anthem where she completely shuts down anyone trying to play games with her. She's not here for superficial connections or guys who are all talk. She makes it clear she's not easily impressed, singing, "no soy un niño soy una mujer" [I am not a child, I am a woman]. She sees right through men who just want to "aparentar que vive como un criminal" [pretend they live like a criminal] or act tough.
She's a force to be reckoned with, declaring, "no estoy hecha de poco y que el reviento los metales honor" [I'm not made of little, and I burst metals, honor]. She's not going to fall in love easily, and she's definitely not looking for a "guille de guapo" [tough guy act]. Basically, if you're not on her level, she's telling you to step aside, because "Zapatero, el zapato conmigo no hay niño de tu amor" [Shoemaker, the shoe, with me there's no child of your love]. She's confident, independent, and knows exactly what she wants – and more importantly, what she doesn't want!