Hackiá' is slang derived from the English word "hacked," twisted into Spanish urban speech. While it literally means hacked, here it's used to describe someone exceptionally unique, special, or impressively different from everyone else.
The line "Es que está muy hackiá'" ("It's that she's so one of a kind") uses the word as high praise, turning a tech term into a compliment about standing out from the crowd.
"HAKiA" is Paloma Mami's own slang for being untouchable, and the whole song is her spelling out why. She opens with a warning about what she does to anyone who ends up with her: "Y cualquier hombre que en esta vida te tenga / Vas a lastimarlo, lo vas a hacer sufrir" [And any man that has you in this life / You're gonna hurt him, you're gonna make him suffer]. Then she gets specific about what sets her apart: "Tiene un corte como si no fuera de acá" [She has a style like she's not from here], and later, "Una muñeca así no la puedes comprar" [A doll like that you can't buy]. One line stays in English mid-verse, "No other girl that can do it, baby", dropped in with no translation needed, because she's bilingual and confident enough not to explain the switch.
The back half turns the song into a dare rather than a complaint. She's not waiting on anyone; she makes the first move herself: "Si hay algo que a mí me gusta, yo soy la que empiezo" [If there's something I like, I'm the one that starts it]. By the time she repeats "Es que está muy hackiá'" [It's that she's too hacked] for the third time, it stops sounding like a boast and starts sounding like something she's just stating as fact.