Sacarrácate is a fun, informal, and very creative command that essentially means "get out of here!" or "scram!"
It's not a standard dictionary word but a playful invention, likely combining sacar (to take out), te (yourself), and acá (here). The extra syllables add a rhythmic punch, making it a powerful and memorable way to tell someone to leave for good, which is the core message of this breakup anthem.
This song is the ultimate "I'm over you" anthem. Xavi kicks things off by making it clear that whatever he had with this person is finished: "Sin mucho verbo lo de nosotros / Se quedó en el ayer" (Without many words, our thing / stayed in the past). He knows they want to come back, but he's shutting that door completely. He's not just sad about the breakup; he's also feeling vindicated, realizing he was right about them all along.
He admits he wasted a lot of time and calls himself a fool for trying to make it work, singing "yo de pendejo en mi mente buscaba una explicación" (like an idiot, I was looking for an explanation in my mind). But now, he's done. He tells them he doesn't even want to see their face and just needs a week to forget them completely. The final command is so blunt and direct: "sacarrácate de aquí" (get out of here). It's a powerful and confident farewell.