Fatulo is a fantastic Puerto Rican slang word for something or someone that is "phony" or "fake". It's not a word you'll find in a standard Spanish textbook, making it a true gem to learn.
In the song, Mora sings "el corazón fatulo" (a phony heart) to describe his ex-lover's insincerity. He uses this word to make a powerful statement about her deceptive nature, contrasting her inauthentic feelings with other things that are physically real. Learning this word gives you a taste of real Caribbean Spanish!
This is the ultimate breakup anthem for when you're completely done with someone. Mora and Jhay Cortez are not holding back at all. The song is a declaration that a relationship is over for good because of lies and betrayal. Mora starts by saying he warned his ex this would happen, telling her, "Tu corazón es de piedra / Y tus lágrimas de cristal" (Your heart is made of stone / And your tears are made of crystal), suggesting he thinks her sadness is fake. The whole thing fell apart fast: "Se derrumbó en minutos lo que construí en dos años" (What I built in two years collapsed in minutes).
Both artists are now taking action, deciding, "Hoy borro tu memoria / Tu contacto y todos tus videos" (Today I'm erasing your memory / Your contact and all your videos). They get super specific about how fake they think this person is, with Jhay Cortez delivering the blunt line, "Tienes las tetas real, pero el corazón fatulo" (You have real boobs, but a fake heart). They tell her to keep all the expensive gifts, from the Louis Vuitton bags to the poodle, because they're moving on. The final message is a cold one: she's going to regret losing him, but it's too late because, as Mora says, "Contigo fue que aprendí a nunca perdonar" (It was with you that I learned to never forgive).