Embustero translates to "liar" or "deceiver". It's a strong, somewhat dramatic word that carries more weight than a simple "mentiroso" (liar), implying a habitual or more serious form of deceit.
In "Kitty", Kim Loaiza uses embustero to directly address her ex-partner, accusing him of being a liar who left her heartbroken. The word choice emphasizes her anger and the depth of his betrayal, making it a memorable and impactful term within the song's narrative of moving on from a toxic relationship.
"Kitty" is Kim Loaiza's confident kiss-off to an ex who let her down. She opens by remembering a night that meant a lot to her, only for him to be careless with it until it was gone.
By the chorus she has moved on. She calls him out for being unpredictable ("un poco freaky") and refuses to answer to the pet name "kitty" he used to call her: she is not his anymore.
The second half turns defiant. She feels stronger and more independent since the breakup ("más suelta"), and even though he tries to reconnect, she makes clear there is nothing left for him, not even a birthday message.