Vagabundas is a beautiful, poetic word that literally means "vagrant" or "roaming", but is used here to mean "wandering". It's a unique and evocative choice that you won't hear in every song.
Natalia Lafourcade sings about "ilusiones vagabundas" ("wandering illusions"), creating a vivid image of the fleeting, superficial attractions her partner chases. This single word perfectly captures the heartbreaking contrast between her deep, unconditional love and his flighty, uncommitted nature.
This song is a fantastic, dramatic declaration of love for someone who just doesn't get it. Natalia Lafourcade sings about being so full of love that it's never enough: "Nunca es suficiente para mí / Porque siempre quiero más de ti" (It's never enough for me / Because I always want more of you). Her heart is literally exploding with love, but the person she's singing to is so used to being adored that they don't even notice. She says, "Acostumbrado estás tanto al amor / Que no lo ves" (You're so used to love / That you don't see it).
She's offering something real and unconditional, but her partner is too busy chasing easy flings. She accuses him directly: "Y tú te vas, jugando a enamorar" (And you go off, playing at falling in love). While he's getting tangled up in meaningless nightly adventures, she's left heartbroken. But she gets the last word with a powerful warning. She tells him he'll regret it, promising, "Te perderás dentro de mis recuerdos / Por haberme hecho llorar" (You will get lost inside my memories / For having made me cry).