Maquinón is a powerful slang term for a huge, impressive car. It's a perfect example of how suffixes can supercharge a word in Spanish.
It comes from the word máquina (car/machine) and adds the augmentative suffix -ón to imply something is big, awesome, or intense. In the song's chorus, KAROL G sings about cruising in her maquinón as a symbol of her success and power.
Get ready to feel powerful! "EL MAKINON" is all about KAROL G flexing her success and independence. She's not waiting around for anyone. Instead, she's out with her crew, "Dando vuelta en un maquinón" [Driving around in a huge car], looking amazing with "un flow cabrón" [a badass style]. The car is a big deal in this song, a symbol of her status. It's a "Lamborghini que en la alfombra dice 'Diablo'" [Lamborghini that says 'Devil' on the floor mat] with dark tinted windows so "pa adentro no se ve" [you can't see inside].
This song is also a bold statement of her confidence and freedom. She's been a rebel her whole life, "Desde chamaquita rompiendo la ley" [Breaking the law since she was a little girl]. Now that she's on top, everyone wants her attention—"El DM explotando, pero es que no hay break" [My DMs are exploding, but there's no time]—but she's moved on. She's in control of her life, her money, and her relationships, calling herself "La verdadera bichota, papi" [The real boss, daddy].