Reviento comes from the verb reventar, which literally means "to burst" or "to explode". It's a very visceral and powerful word used to describe reaching a breaking point.
In the song, Íñigo Quintero uses it metaphorically to express being completely overwhelmed by his emotions, singing, "Y es que cierto que reviento cuando pienso en todo" (And it's true that I burst when I think about everything). This vivid imagery perfectly captures a feeling of intense internal pressure, making it a dramatic and memorable word to learn.
Spanish singer Íñigo Quintero sounds completely overwhelmed in this track, and he admits it right from the jump. The world around him is spinning out of control: "Todo va muy rápido / No encuentro el momento de parar" ("Everything moves so fast / I can't find the moment to stop"). Instead of pretending he has it all together, he calls himself out with "Como soy un cobarde" ("Since I'm a coward") for drying his tears in secret and hiding how much he is struggling. He cannot tell who is lying to him, and he feels watched in a way that genuinely hurts: "No distingo sus mentiras / Me hace daño si me miran así" ("I can't tell their lies apart / It hurts me when they look at me like that").
By the chorus, he hits the core question of the song: "No sé qué es lo que queda de mí" ("I don't know what's left of me"). He talks to someone who supported him—someone he thought he resembled—while acknowledging that this bond might have cost him a piece of himself ("Tal vez, lo que me hizo morir" ["Maybe, what made me die"]). Notice the colloquial bite in "reviento" when he says "Y es que cierto que reviento / Cuando pienso en todo y lo que tú haces por mí" ("And it's true that I burst / When I think about everything and what you do for me"). In Spanish, reventar literally means to burst or pop like a balloon, but colloquially it means you are completely overwhelmed with emotion to the point of breaking. It is a blunt, honest track about losing your footing when life speeds up too fast.