Fleje is a colloquial term, particularly common in the Canary Islands (where Cruz Cafuné is from), meaning "a lot" or "plenty". It's a vibrant piece of regional slang that adds a unique flavor to the lyrics.
In the song, it appears in phrases like "los titanes aman fleje" (the titans love a lot) and "hay fleje entierro y poca boda" (there are a lot of funerals and few weddings), giving a strong sense of abundance or intensity to the situations described. Learning fleje offers a glimpse into the diverse and rich informal Spanish spoken in different regions.
"Amén" is Cruz Cafuné praying in his own way, and the prayer sounds a lot like Tenerife street talk. It opens with "Fiolo, reza fiolo" (dude, pray, dude), where fiolo is Canarian slang for a guy, and a warning: "Reza que no sabes quién te puede joder" (pray, because you don't know who can mess you up). He paints himself as "educadito siempre, contestón cuando toca" (always polite, mouthy when it's called for), driving "descamisao" (shirtless) and scoring "golazos en cholas" (great goals in flip-flops, cholas being the Canarian word for them).
Then it gets serious. There's a scene of pressing gauze against a stomach wound while a friend says not to call an ambulance, and a heavy line: "hay fleje entierro y poca boda" (there are loads of funerals and hardly any weddings). He names friends who were killed, Dailos and Ayoze, and admits his chain is "chapa bañada: puro postureo" (plated tin, pure show). The message he keeps returning to is softer than the setting: "Odiar es pa' flojitos, los titanes aman fleje" (hating is for weaklings, titans love a lot), and he wants people to forgive each other and say "te quiero" (I love you), "poniendo de moda amar de nuevo" (making love fashionable again). It ends at sea, with Yemayá, the ocean goddess of Santería, at his side. Tough and tender at the same time, and full of island slang to learn.