Lujurioso means 'lustful' or 'lecherous'. It's an intense and relatively uncommon word in romantic Spanish songs, making it stand out immediately.
In the lyrics, the singer describes having quenched his youthful illusions "con lujurioso amor" (with lustful love). This choice reveals a deep sense of regret, contrasting a pure, romantic ideal against the raw, physical passion that ultimately left him unfulfilled. The word perfectly captures the bittersweet memory of a love that burned bright but was never built to last.
This song is a classic tale of looking back on a love affair that ended in disappointment. The singer feels like a fool. He gave his everything to this person, his whole soul even, singing, "El alma entera yo le di" (I gave her my whole soul), thinking they were building something serious and lasting.
But he was wrong. He realizes with a heavy heart that while he was planning a future, she was just looking for a good time. The song's title and final lines say it all: she just wanted "el amor / De loca juventud" (the love of a crazy youth). All his hopes and dreams for the relationship are now dead, along with her "promesas crueles" (cruel promises).