Mariposas literally means "butterflies." While it's a common word, its use in this song is particularly evocative and culturally significant.
In Spanish, the phrase "tener mariposas en el estómago" (to have butterflies in the stomach) is a common idiom for feeling nervous or excited, especially in a romantic context. The artist sings, "Pero ellas me matan mis mariposas" (But they kill my butterflies), implying that other relationships extinguish the special, nervous excitement he feels with the person he truly loves. This makes the word a powerful symbol of genuine affection and unique connection.
Nanpa Básico's "Cuando Vienes" is a really honest look at a complicated love. He's clearly been through a lot, saying, "Yo como casi siempre solo / Roto de costumbre, consumiendo cosas" [I, as almost always alone / Broken by habit, consuming things]. But when this special person comes into his life, everything changes. He loves it "cuando vienes limpia / Me salvas la vida con tu luz de diosa" [when you come clean / You save my life with your goddess light]. It's like she brings a pure, saving energy that pulls him out of his usual struggles.
He's not looking for anything fake or complicated; he just wants her to arrive "sin preludios y me besas" [without preludes and you kiss me]. He admits, "Doy más problemas que regalos, vivo en crisis" [I give more problems than gifts, I live in crisis], and even says, "Me odio por maldito y por lo que hice contigo" [I hate myself for being cursed and for what I did to you]. Despite his past mistakes and difficult life, he still misses her constantly, even if he doesn't say it. He accepts her completely, no matter what, saying, "Te acepto incompleta o como vengas" [I accept you incomplete or however you come]. It's a raw and open confession of how much he values her presence, even with all his personal baggage.