Aguijón literally translates to "sting" or "stinger", like from an insect. It's a vivid and somewhat unexpected word to find in a love song.
In this song, Willie Gonzalez uses the proverb "Un aguijón con otro dicen que se saca" (They say one sting is removed with another). He's using this metaphor to express the idea that the pain of a past love can be healed or forgotten by a new love, suggesting a unique and intriguing approach to mending a broken heart.
Have you ever heard the saying, "The best way to get over someone is to get under someone new"? That's the heart of this passionate salsa song. The singer is pleading with a new love interest to help him forget a painful past relationship. He begs her to "Tómame en tus brazos" (Take me in your arms) and give him a "beso sin fin" (endless kiss) to erase the memory of his ex.
He's not just asking for a distraction; he's asking to be saved from a "sufrimiento" (suffering) and a "pesadilla" (nightmare). He wants this new person to completely replace the old one, to "Borra sus huellas de mi mente y de mi alma" (Erase her footprints from my mind and my soul). It's a raw and desperate request for a new love to be the cure for an old heartbreak.