Jacarandá refers to the jacaranda tree, known for its beautiful purple flowers. It's a specific and evocative word that isn't commonly found in song lyrics, making it stand out.
In the song, the jacarandá appears twice, first in the line "Tu vientre y tu jacarandá" and later as "Marchitada de un jacarandá". It seems to symbolize beauty, nature, and perhaps a sense of rootedness or a specific place, adding a poetic and slightly mysterious layer to the lyrics.
The song opens dizzy. "Giros, todo da vueltas como una gran pelota" (Spins, everything spins like a big ball), followed by the odd admission that nobody can tell it is happening: "Todo da vueltas, casi ni se nota" (Everything spins, you hardly notice). Then she arrives. Milo j calls her "dama magistral" (masterful lady), puts the gates of Eden on her body, and asks flat out for "Haceme el amor como animal" (Make love to me like an animal). The voseo is Buenos Aires all the way down, and so is the jacarandá, the purple street tree he keeps returning to.
What keeps this from being a straightforward love song is a line he sings twice, with the doubt swapped for certainty the second time: "Y aunque el diablo blanco te consumió" (And although the white devil consumed you), then later "Sé que el diablo blanco te consumió" (I know the white devil consumed you). The white devil is not hard to decode, and what he wants for her afterwards is tiny and enormous at once: "Te quiero ver ser" (I want to see you be). Just be. The title lands near the end, in "Sos la diosa ama de mi sol" (You are the goddess, mistress of my sun), which is a strange bit of grammar to hang a chorus on. An ama de casa is the woman who runs the house, so ama de mi sol makes her the one who keeps his daylight. The flower he feels in her arms is already "Marchitada de un jacarandá" (Withered, from a jacaranda). He knows how this goes and he stays anyway.