Reemplázame is the command form of the verb reemplazar, and it literally means "Replace me". It's a powerful and dramatic word that you won't hear every day.
In this heartbreaking song, the singer is so incapable of getting over his ex that he begs her to find someone new. It's a selfless yet desperate plea, hoping that seeing her with someone else will finally give him the closure he can't find on his own.
This song from Colombian band Morat is a truly unique take on a breakup. The singer knows he needs to move on, starting the song by saying, "Para variar, por fin hoy pienso en mí" (For a change, today I finally think of myself). But he immediately admits he isn't strong enough to do it. So, he comes up with a wild plan: he begs his ex to do the hard work for him.
His big, desperate request is right in the title: "Enamórate de alguien más" (Fall in love with someone else). He literally asks her to replace him because, as he says, "no soy capaz / De olvidarte" (I'm not capable / Of forgetting you). He even asks her to give him a reason to be angry, pleading, "Dame una excusa para odiarte" (Give me a reason to hate you), because he thinks it would be easier than dealing with all the good memories. It's a song about being so stuck in heartbreak that you'll ask for anything to make the pain stop.