Hidromassagem literally translates to "hydromassage," but in common usage, especially in Brazil, it refers to a jacuzzi or hot tub. It's a more specific and luxurious word than just "bath."
In the song, the artist imagines a romantic and intimate scene: "Imaginando a gente na hidromassagem" (Imagining us in the hot tub). This word evokes a sense of relaxation, intimacy, and a bit of indulgence, making it an enticing and memorable word that stands out from everyday vocabulary.
"Quarto Andar" ("Fourth Floor") is about calling someone up late at night because you miss them, and being upfront about wanting them back.
The singer admits she's tired of the fighting and the back-and-forth, but hearing their voice still stirs up everything she's been trying to hide. She's done pretending she doesn't wait around for a reply. The song moves from that vulnerability into a confident, playful invitation: come find her on the fourth floor, and she'll show them everything, no games this time.
It's a song about desire winning out over pride, delivered with a wink rather than heartbreak.