Humos literally means "smokes" or "fumes." However, in the context of this song and common Spanish idioms, "se te bajaron los humos" is a colloquial expression meaning "your airs came down" or "you've been brought down a peg."
It refers to someone who was once arrogant or full of themselves, but has now faced a humbling experience. The song uses this phrase to tell a person who left proudly but returned defeated that their arrogance has vanished, and they are now seeing reality.
Darío Gómez's "Se Te Bajaron Los Humos" is a powerful song about a person who once thought they were better than everyone else, but now they're facing the consequences of their arrogance. The singer is blunt, asking, "por qué saliste alegre y volviste llorando?" [why did you leave happy and come back crying?]. It's clear that the person who left with such confidence has returned defeated, and the singer isn't holding back on saying, "se nota la tristeza de tu rostro angustiado" [the sadness on your anguished face is noticeable].
This song is a real wake-up call for someone who tried to dominate the singer, believing they were too good for them. The lyrics, "quisiste dominar me al ver que era muy tuyo que hiciste que por orgullo te llevará las nubes" [you wanted to dominate me, seeing that I was very much yours, you made pride carry you to the clouds], really hit home. Now, the tables have turned, and the singer delivers the ultimate truth: "tú que andabas por las nubes quien y dios tus alas que hoy vas por el suelo se te bajaron los humos" [you who walked among the clouds, who gave you your wings, today you walk on the ground, your arrogance has come down]. It's a satisfying moment of karma, showing that humility is a lesson learned the hard way.