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.
Xavi wastes zero time dancing around the truth in "Una Semana." Right out of the gate, he drops "Ya la capté" ("I finally get it") and makes it clear that the romance is stuck in the past: "lo de nosotros se quedó en el ayer" ("what we had stayed in yesterday"). He is not trying to be gentle, either. He admits he wasted his time looking for excuses when he already knew deep down that she was bad news: "Pero yo de pendejo en mi mente buscaba una explicación" ("Like an idiot, I was searching for an explanation in my mind"). The Mexican slang word pendejo is blunt self-mockery here, basically admitting, "Yeah, I was a fool to stay."
Instead of wallowing forever, he sets an ambitious deadline to move on. He looks her in the eye and tells her, "Dame una semana para olvidarme de ti" ("Give me one week to forget you"), followed by the punchy dismissive phrase "sacarrácate de aquí" (a playful, slangy way to shout "get the heck out of here"). He knows the breakup stings both sides—acknowledging "te cala que no me vas a ver mañana" ("it hurts you that you won't see me tomorrow," where the slang verb calar means to hurt or bother someone). Still, his mind is made up. Seven days is all he needs to scrub her memory clean, and he wants her out the door right now.