Tebeos refers to 'comic books' or 'graphic novels', a term that is quite specific to Spain and evokes a strong sense of nostalgia for childhood.
In the song, it's used to paint a picture of childhood memories, specifically "De tus cromos y tebeos" (Of your trading cards and comic books). It's a charming and less common word than the more general "cómics", making it particularly evocative of a bygone era and a unique cultural touchpoint.
A Spanish childhood, read back as a list of objects: swap cards and comics, the hedgehog that was pink, two television channels and someone upstairs deciding whether the film with a thousand special effects — and a man called Darth Vader — reached your screen at all. El Canto del Loco are not being vague about nostalgia. Every line is something a kid growing up in Spain around 1980 could name, down to Elliot's flying bike and the Verano Azul children still calling for Chanquete as the song runs out.
The chorus is where it turns. You were in such a hurry to be older: you copied your idols in the living room, you were going to score at the '82 World Cup, you were going to be the princess of a prince who never turned up. Your mother told you it was not good to invent a thousand fantasies, to live in a world of yellow tiles. The band never says who was right. They just repeat the wanting three times and stop.