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!
"Party" pairs Puerto Rican powerhouse Bad Bunny with Rauw Alejandro for a club track where nobody wants a serious relationship. The girl in the song has been single for a while, staying off social media ("Ella lleva un tiempo soleá / Pero en las redes no sube nada" [She's been single for a while / But she doesn't post anything on social media]), and she is tired of overthinking. She checks herself in the mirror, knows she looks great ("Se miró al espejo / Y vio que está buenota" [She looked in the mirror / And saw that she looks hot]), and just wants to let loose and dance perreo all night.
From there, the lyrics dive straight into explicit, late-night hedonism across San Juan. The duo name-drops local nightlife spots like Treehouse and Ocean Park before sneaking off to Santurce, promising luxury rides in a Porsche Taycan and wild rides on Can-Am off-road vehicles. Rauw even nicknames himself "El Zorro" (The Fox) while Bad Bunny is "El Conejo" (The Rabbit). It is loud, blunt, and unapologetically raunchy, especially when Benito jokes about people being quick to judge others: "Todos son santos / Cuando hablan de los pecados ajenos" (Everyone is a saint / When they talk about other people's sins). It is an all-out anthem for skipping heartbreak and heading straight to the after-party.