Agonizar is a powerful verb that means 'to agonize' or 'to be in agony'. It's a fantastic word for expressing intense suffering, much stronger than simply being sad.
In the song, the artist sings, "Es tu ausencia la que me hace agonizar" (It's your absence that makes me agonize). He uses this dramatic word to describe the deep emotional pain he feels because he is separated from the person he loves. It's a very poetic way to convey just how much he misses them.
If you have ever been hopelessly lovesick and stuck far away from your crush, this track hits right at home. Los Primos del Este blend their signature corrido tumbado sound with straight-to-the-point romance. The narrator is spiraling because of the physical distance between them, admitting, "Sufre mi cora porque no te tengo aquí" [My heart suffers because I don't have you here]. Notice the word cora? That is casual, affectionate Spanish slang for corazón (heart). He even admits that the separation makes him agonize ("Es tu ausencia la que me hace agonizar" [It is your absence that makes me agonize]), but instead of just moping around, he offers a direct solution: buying a plane ticket.
He is completely obsessed with her, bluntly stating, "Me traes loco, chiquitita / Me trae loco tu boquita" [You drive me crazy, little one / Your little mouth drives me crazy]. The term chiquitita is a sweet, playful pet name (literally "tiny girl"), and the diminutive -ita on boquita adds an extra layer of endearment. He keeps repeating his simple proposition: "Dime si estás de acuerdo / Para comprarte el vuelo" [Tell me if you agree / So I can buy your flight]. It is direct, catchy, and shows that when you really want someone, plane tickets are the ultimate love language.