Fléchame is a fun, poetic command that literally means "shoot me with an arrow". It comes from the Spanish word for arrow, flecha.
Of course, the singer isn't asking for a literal arrow! In this romantic context, it's a creative way of saying "make me fall in love with you," as if asking Cupid himself to strike. It's a passionate and memorable plea that adds a touch of poetry to this flirty reggaeton hit.
This song is a full-on declaration of obsession for one specific person. The main hook says it all: "Si no es contigo, amor / Yo no quiero a nadie más" [If it's not with you, love / I don't want anyone else]. Cris Mj and JHAYCO are completely focused on their one and only, mixing sweet compliments with some very direct, spicy language. They jump from romantic ideas like "Mamita, casémono'" [Mamita, let's get married] to admiring how good she looks in her pajamas, and they make it clear there is no Plan B.
Then Kali Uchis comes in and flips the whole thing around. She knows she's the one they're obsessed with, and she owns it. She calls herself "la gata fina" [the classy cat] and confirms she's the one he needs. She's not just a passive object of desire; she's powerful, confident, and fully aware of her effect on him. She knows he'd do anything for her, saying, "Give me whatever I want, he know I'm worth it." It's a fun power play where everyone agrees on one thing: it's all or nothing for this one person.