Desliz literally translates to "slip" or "lapse", often implying a minor mistake or indiscretion. It's a more nuanced word than a simple "error" or "mistake".
In this song, the singer uses desliz to refer to a moment of weakness or a one-night stand that has now complicated his life. He sings, "Que un desliz tuvo más fuerza que mi voluntad" (That a slip had more strength than my will), highlighting how this single lapse in judgment has led to a much deeper emotional entanglement.
Jhonny Rivera's "Cómo Le Explico" is a really honest, and a little bit messy, look at a man caught between two relationships. He's in a tough spot, trying to figure out how to tell the person he's with that he's fallen for someone else.
He admits that he had a passionate night with another woman, and since then, he can't get her out of his head. She's become an "obsesión" [obsession]. He's struggling with how to explain that this new person, with her "encantos y su brillo" [charms and sparkle], brought out the "perro infiel que había en mi interior" [unfaithful dog that was inside me]. He knows he doesn't want to hurt anyone, but he's clearly in deep, saying "caí en la más bella tentación" [I fell into the most beautiful temptation] and that this new person has won over his will. It's a classic dilemma, and he's just trying to figure out how to confess it all.