Emborráchala is a command that means "get her drunk." It's a very direct and somewhat provocative word that immediately grabs attention.
In the context of the song, the singer advises his friend to get his ex-girlfriend drunk because he believes that's the only way she'll reveal her true feelings and admit she still cries for him. This word is central to the song's dramatic premise and emotional core.
Have you ever felt like your ex moved on, but you're sure they still have feelings for you? In "Pregúntale Por Quién Llora," Jessi Uribe and Felipe Peláez sing from the perspective of a man talking to his ex-girlfriend's new partner. He warns the new boyfriend not to believe everything he sees. The singer remembers when he was the one walking hand-in-hand with her, thinking their love was perfect and being called the "couple of the year."
He sarcastically toasts the new couple, saying, "Cheers to that love / You have my blessing," but he's confident he's the one she truly misses. He gives the new boyfriend a challenge: "Just get her drunk / And ask her who she cries for." The singer is convinced that if her new partner does this, she will reveal that she is still crying over him, proving that her new love isn't as perfect as it seems.