Malgastar means 'to waste' or 'to squander'. It's a strong verb that conveys a sense of regret and futility, making it more impactful than a simpler word for 'waste'.
In the song, the singer asks, "¿De qué me sirve malgastar mi voz?" (What good is it for me to waste my voice?). This highlights his frustration and the realization that his efforts to call out to his lost love are in vain, adding a layer of emotional depth to the lyrics.
"Idiota" is Morat and Danna Paola singing about the 3 a.m. moments when memory outlasts a breakup. The narrator can't shake the ex who "knocks" on their thoughts every night, torn between shutting the door on the memory and secretly letting it back in.
The chorus admits the contradiction at the center of the song. He swears he'll never forget her, knows chasing a love that's already over makes no sense, and calls himself an idiot for still looking anyway.
The bridge turns the blame inward and outward at once. Everyone tells him patience will win her back, but he sees the real cost of that waiting game, stuck pretending until the closing "como un idiota" refrain fades the song out on the same confession it started with.