Superón is a colloquial and somewhat unique word, not commonly found in everyday Spanish or many songs. It's a augmentative form of "golpe" (hit) or "puñetazo" (punch), implying a very powerful or significant blow.
In the context of the song, the artist sings, "Y cargo un superón por si el diablo se me atraviesa, yo sí le voy a dar pelea." This suggests he's ready to deliver a powerful counter-attack or fight back forcefully if challenged, even by the devil himself. It conveys a sense of readiness and strength.
Edgardo Nuñez's "Sin Miedo" is a really personal and honest song, starting with a dedication "Pa' todos los que tienen un ángel allá en el cielo" [For all those who have an angel in heaven]. It feels like he's talking directly to us, sharing his journey.
He tells us about his beginnings, how he wanted to know "qué se siente tener dinero" [what it feels like to have money]. He took a big risk, investing his savings and even pawning a chain his grandfather gave him. Luckily, things worked out, and he's grateful. But even with his success, he reminds us, "el corazón sigue siendo el mismo, no soy corriente" [my heart is still the same, I'm not common]. He's also really open about the sacrifices he made, regretting that he lost family by being too focused on work. He even apologizes to his daughter, saying "papá anduvo ocupado" [dad was busy]. It's a powerful reminder that some things, like family, "no se compra" [can't be bought]. He also warns us about trusting the wrong people, saying he gave "la confianza a una rata" [trust to a rat], but he's not afraid to stand his ground. He even says, "cargo un superón por si el diablo se me atraviesa, yo sí le voy a dar pelea" [I carry a big gun in case the devil crosses my path, I will fight him]. And in a funny, blunt moment, he admits, "Soy enamorado, chingada madre, ese defecto no se me quita ni a balazos" [I'm a lover, damn it, that flaw won't go away even with bullets], sending a kiss to his "hermosuras" [beauties]. It's a raw, real look at his life, triumphs, regrets, and all.