Burbujea is the verb for "to bubble" or "to fizz". It's a fun, onomatopoeic word that sounds a bit like the action it describes, making it very memorable.
In "Impacto", the singer uses it to create a vivid physical sensation: "Y burbujea la sangre que corre por mis venas" (And the blood that runs through my veins bubbles). This isn't a common expression, and it powerfully conveys the intense rush of emotion—a mix of excitement and anxiety—that he feels just from being near this person.
Ever been so completely floored by someone that you can barely stand up straight? That's the feeling at the heart of "Impacto." The singer is totally intimidated by a person with "Esos brazos cruzados / Y ese seño enojado" (Those crossed arms / And that angry frown). But instead of being scared off, he's fascinated.
This isn't just a simple crush; it's a full-body, over-the-top reaction. He claims that if this person even looks at him, "Me tumbas del impacto y te echas a reír" (You knock me down from the impact and you start to laugh). The lyrics get even more dramatic, comparing this person's power to the sun itself, saying the sun "Se ve opacado a tu lado" (Looks dull next to you). It's a song about being so overwhelmed by someone's presence that you feel like you might just have a heart attack on the spot.