Cartagine refers to the ancient city of Carthage, a powerful rival of Rome that was famously destroyed after the Punic Wars. It's a unique historical reference that adds a layer of depth to the lyrics.
In the song, Mahmood sings, "Poi cadiamo giù come Cartagine" (Then we fall down like Carthage). This vivid simile evokes a sense of dramatic, irreversible collapse, suggesting a relationship or situation heading towards a catastrophic end, much like the fall of the ancient city.
Mahmood kicks this song off with a relationship that sounds like a total mess. His partner is telling him to get lost: "Dicevi sempre: 'Vattene via / Che non mi importa più di te'" (You always said: 'Go away / I don't care about you anymore'). He feels like any romantic gesture is pointless, asking why he should write a poem "Se brucerai le pagine" (If you'll burn the pages). The whole thing feels clumsy and destructive, like they are "Leggeri come elefanti / In mezzo a dei cristalli" (Light as elephants / In the middle of crystals). It's a brilliant and funny way to describe a relationship that is doomed to break everything around it.
Even though he says dying for this person is useless, he's still drawn to them. They tell him, "Cercami nel barrio" (Look for me in the neighborhood), sending him on a chase. The barrio, or neighborhood, becomes the center of their world. Despite the drama and the feeling that his home isn't good enough for them, his partner still shows up "Per ballare con me" (To dance with me). The song leaves you with this feeling of a magnetic, maybe toxic, connection that they just can't quit, all pulled together by the constant rhythm of the barrio itself.