Cenicero literally means "ashtray". It's an interesting and somewhat unexpected word to find in a song, making it memorable.
In the context of the song, the line "Yo te regalo el cenicero, Quémalo todo, yo te espero" (I give you the ashtray, Burn it all, I'll wait for you) suggests a deep level of acceptance and patience. The singer is offering a space for the other person to release their frustrations or pain, implying unconditional support. This metaphorical use of a common object gives it a unique and poignant meaning within the lyrics.
Girl Ultra's "Blu" is such a sweet and understanding song. It feels like she's talking to someone who's feeling a bit down and out, someone who "te pintaste la cara de azul" [painted your face blue]. It's like they tried something, and it just didn't work out, leaving them with unfulfilled desires: "Nada salió como pensabas Y te quedaste con las ganas" [Nothing turned out as you thought And you were left wanting].
But even though this person is feeling blue, Girl Ultra is right there with them, offering unconditional support. She says, "Yo a ti te quiero como quieras tú" [I love you however you want], which is such a comforting line. She's even willing to let them burn everything down and wait for them: "Yo te regalo el cenicero Quémalo todo, yo te espero" [I'll give you the ashtray Burn it all, I'll wait for you]. It's a beautiful picture of patience and acceptance, acknowledging that sometimes, especially in youth, things just are what they are: "Es el efecto de la juventud Un año más que damos vuelta" [It's the effect of youth One more year that we turn around].