Cojones is a very versatile and strong Spanish slang word that literally translates to "balls" (testicles). However, its meaning changes drastically depending on the context and accompanying prepositions.
In this song, it's used in phrases like "te quiero con cojones" (I love you with all my guts/passion) and "a mí sin cojones" (I don't give a damn). This word is incredibly common in informal Spanish, especially in reggaeton and trap music, and understanding its various uses is key to grasping the raw emotion and attitude in many songs.
Joyce Santana's "Tu Canción" featuring Amarion is a super direct and honest track about a complicated, no-strings-attached kind of love. The song is literally your song, even though the singer usually doesn't dedicate songs to anyone. He's not one to say "I love you," but he makes it clear he loves this person "con cojones" [with balls/a lot].
It's all about a relationship that defies expectations: "Somos como somos, nunca como se supone" [We are how we are, never how we're supposed to be]. They don't ask questions or give explanations. He's constantly thinking about her, even if she doesn't believe it. The lyrics are pretty explicit about their physical connection and the intense situations they find themselves in. He even admits to lying to her, but tells her not to get revenge. It's a raw, unfiltered look at a passionate and unconventional bond.