Lodo means “mud,” a thick, messy mixture of wet earth. In the song, the phrase “bajo el lodo a veces hay diamantes” (“sometimes there are diamonds beneath the mud”) is a poetic metaphor, suggesting that someone overlooked or judged as worthless may have hidden beauty and value.
Vicente Fernández’s “El Último En La Fila” (“The Last One in Line”) speaks from the position of a man who feels rejected and judged. He asks, “¿Qué tal si tratas al último de la fila?” [What if you gave the last one in line a chance?] He calls himself “el peor de todos, al que no sabe amar” [the worst of them all, the one who does not know how to love], and says that fate has sent him to someone who is afraid of him and does not want to look at him. The image is blunt and a little playful: the person everyone ignores might be the one worth noticing.
The song’s central image is beautiful: “Bajo el lodo a veces hay diamantes” [Sometimes there are diamonds beneath the mud]. The speaker invites the other person to open their eyes and discover the love inside him. He says she was already shining in his soul before her own stars began to shine, which makes his devotion sound grand and wonderfully old-fashioned. When he adds, “Lo dijo Cristo” [Christ said it], he refers to the idea that the last can become the first, and applies it to love: the person she overlooks could be the one who will adore her forever and “ponerte un altar” [place you on an altar]. It is a big promise, but that is part of the song’s charm. He is asking her to look past appearances and give the last man in line a chance.