Costera translates to "coastal" and refers to anything related to the coast or shoreline. It's a descriptive word that paints a picture of a specific setting.
In the song, Farruko sings about driving "por la zona costera" (along the coastal zone), immediately transporting the listener to a scenic drive by the ocean. This word is interesting because it evokes a vivid image and connects directly to the song's vibe of a carefree, sunny adventure.
REGGAEGUAIRA opens on a tempo count, '167BPM,' before Farruko and Louis BPM turn a hot day into an invitation: 'Hoy está haciendo calor y quiero hacerte llover' [Today it's hot and I want to make you rain]. The whole song moves at that speed: it chases a coastal drive instead of staying still, 'Ando en el turbo, 911 carrera' [I'm riding in the turbo, a 911 Carrera], with nowhere to go but the beach and nothing holding either of them back, 'Es que estoy soltero y también estás soltera' [It's that I'm single and you're single too].
It ends on a smaller, steadier line than anything else in the chorus: 'Tú sabes que yo siempre te espero donde vayas' [You know that I always wait for you wherever you go]. One quiet promise tucked at the end of a song that otherwise never slows down.