Maquinear is a cool, creative slang verb you'll hear in Puerto Rico, derived from the word máquina (machine).
It means 'to scheme', 'to plot', or to think really hard about something, as if your brain's gears are turning. In the song, Bad Bunny says, "Me pone a maquinear", meaning a girl's mysterious vibe is making his mind race and start plotting about what will happen next. It's a perfect word to describe the start of a wild story!
This song is a straight-up celebration of a woman who is newly single and feeling herself. After being alone for a while, she looks in the mirror and realizes, "vio que está buenota" [she saw that she's super hot]. She's tired of overthinking things and decides she just wants to let loose and have a good time. She doesn't want a relationship or to be tied down, she just wants a "Party, party, party, party."
Bad Bunny and Rauw Alejandro jump in to describe the wild night they want to have with her. The lyrics are incredibly direct and confident, detailing a night of dancing, drinking, and more. They even suggest she's bold enough to take on both of them, asking, "Y que se atreve con Benito y con Rauw" [And that she dares to be with Benito and Rauw]. It's all about living in the moment, from getting lost in Santurce, Puerto Rico, to promising to buy her a Porsche. The whole track is an anthem for feeling free, confident, and ready for a wild night out.