Centella translates to "spark" or "lightning". It's a vivid and somewhat poetic word that evokes a sense of sudden brilliance and fleeting beauty.
In the song, it's used to describe the arrival of "Celeste" (a celestial being or perhaps a new love) as something born "cual centella" (like a spark or lightning flash). This imagery suggests a powerful, quick, and perhaps ephemeral presence, making it a captivating word choice.
"Celeste" imagines a fleeting presence arriving like a shooting star into a life that feels broken and empty. The singer welcomes her in, even knowing she is only passing through and will burn out just as fast as she appeared.
Against a world he describes as full of deception and darkness, her brief light is enough to bring a smile. The song closes on defiance: whether people love him or hate him for it, nothing will dim the light she left behind.