Indeleble means 'indelible', something that cannot be removed or washed away. It's a strong and evocative word that immediately grabs attention.
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This song is pure confidence mixed with obsession. The singer is totally sure that his ex will never forget him, no matter how hard she tries. When he says, "Me dices que será muy fácil / Yo digo que será imposible" ["You say it will be very easy / I say it will be impossible"], he is arguing that getting him out of her mind is basically unrealistic. For him, their connection is so strong that something as huge as "Primero los polos, deben derretirse" ["First the poles would have to melt"] would have to happen before she could erase him.
The lyrics are full of bold images of permanence. He calls his kisses "inolvidables" ["unforgettable"] and describes himself as "Indeleble" ["indelible"], like ink or a stain that cannot be erased. When he says, "Soy un tatuaje que por siempre deberás tener" ["I am a tattoo that you will have to have forever"], the idea is that their relationship is permanently marked on her skin and memory. It gets very possessive when he says her body has "la etiqueta de mi propiedad" ["the label of my property"], which is intense and a bit controlling. He predicts that no one will love her like he did and that she will eventually come back "buscando mi piel" ["searching for my skin"]. The whole song turns a breakup into a kind of challenge: she wants to move on, and he is absolutely convinced she cannot.