Velador literally translates to 'night watchman' or 'guardian'. It's a word that evokes a sense of silent vigilance and protection.
In this song, Junior H uses velador to describe himself as someone who watches over his beloved from a distance, like a secret protector. He sings about being her 'velador' through the night, highlighting a deep, almost obsessive, longing and devotion.
A velador in Mexico is the night watchman, the guy who sits up guarding a building until dawn. Junior H takes that job title and turns it into a love song. It opens with him wondering about her: "Qué estarás haciendo" [What could you be doing], and guessing "Tal vez ya estás rendida y cansada" [Maybe you're already worn out and tired]. She is going to sleep. He is not. His promise is "Voy a velar tu cama" [I'm going to keep watch over your bed], and he plans to be a "Presencia en tu ventana" [A presence at your window] all night.
The shift schedule is the best part. "Me iré junto con el sol / Y vendré con la luna hoy" [I'll leave along with the sun / And I'll come back with the moon tonight], so he clocks out at sunrise and clocks back in at dark, every night. Is it sweet or a little bit creepy? Honestly, both, and the sleepy guitar keeps it on the sweet side. Listen for the spoken bits in the middle too. "Pura Marca MP, viejo" [Pure Marca MP, man] is a shout-out to Marca MP, the group singing with him, and "No se me agüite, Compa Junior" [Don't get down, buddy Junior] uses agüitarse, Mexican slang for feeling bummed out, while compa is short for compadre, a close friend.