Flechándome comes from the verb flechar, literally 'to shoot with an arrow'.
The song says Cupido flechándome, conjuring the vivid, romantic image of Cupid mid-shot, the exact instant love strikes. Its unusual gerund-plus-pronoun form makes it memorable and a great entry point to learn how Spanish packs action and object into a single, expressive word.
Have you ever fallen head over heels for someone before the night even ended? Colombian band Morat gives us the ultimate fast-forward romance in "En Un Sólo Día" (In Just One Day). The story kicks off in the corner of a dimly lit watering hole: "Sentado en el banco de aquel viejo bar, yo tímidamente te invito a bailar" ("Sitting on the stool of that old bar, I shyly invite you to dance"). What follows is a dance floor marathon of "bachata, merengue y boleros", packed with hushed whispers and bodies bumping to the beat until Cupid hits his mark.
The real punchline hits the second the lights turn on and everyone heads home ("cada cual a su casa"). Even though they barely know each other, the narrator heads out the door with an obsession already taking root: "Yo me voy con tu cara pegada en el alma" ("I leave with your face stuck to my soul"). It is completely over the top, and he knows it. He confesses that his sudden feelings broke every standard rule of dating ("el sentimiento venció las reglas que había"), leaving him missing this stranger as if they had known each other for years.