Cojones is a highly versatile and very common Spanish slang word, literally meaning "testicles." However, in this context, it's used to express intense emotion or emphasis, similar to saying "it hurts like hell" or "it hurts a lot."
In the lyrics, "Duele con cojones tenerte que decirte bye, negra," the artist uses it to convey the profound pain and difficulty of saying goodbye. It's a raw and impactful word that adds a strong emotional punch to the line, making it memorable and authentic to the song's feeling.
Alvaro Díaz's "El Último Baile (Mia 5)" featuring Kablito is a raw, emotional look back at a love lost, filled with regret and longing. It's a story of a relationship that felt like a modern-day "Bonnie and Clyde," a powerful connection that somehow fell apart, and the singer is left wondering, "To' se jodió y no sabemos why, negra" [Everything got messed up and we don't know why, black girl].
He admits his ego got in the way, leading to his downfall, like McGregor in a fight. He reflects on how he messed up countless times, but she loved him despite his flaws: "Contigo era perfecto todo lo imperfecto / Y tú me quisiste así, con todos mis defectos" [With you, everything imperfect was perfect / And you loved me like that, with all my flaws]. The pain of not being able to text her, of thinking about her, is palpable. He wishes he could go back to that last kiss, vowing, "Si supiera que aquel era el último beso que te daba / Te juro que nunca me despegaba" [If I knew that was the last kiss I gave you / I swear I would never let go]. It's a heartbreaking confession of a love that, despite the pain, he can't let go of, even if it means hating himself more than her.