Diosa literally means "goddess," the female equivalent of dios (god). It's a powerful and romantic word that you won't hear every day.
In this song, the singer goes beyond calling his love beautiful by singing, "Rosa tú eres la diosa" (Rose, you are the goddess). This is the ultimate compliment, elevating her to a divine status and expressing the highest level of admiration.
This song by Colombian artist Fabi Hernandez is a pure, simple celebration of a person named Rosa. The lyrics are a direct and repeated declaration of how beautiful she is. He starts by comparing her to a flower, singing, "De las flores la más hermosa / Esa eres tú mi linda rosa" (Of all the flowers, the most beautiful / that is you, my pretty rose).
There's no complicated story here, just total admiration. The whole song repeats the phrase "Rosa qué linda eres" (Rosa, how pretty you are) like a joyful chant. The compliments get bigger and bigger as the song goes on, moving from calling her "la más hermosa" (the most beautiful) all the way up to "la diosa" (the goddess). It's a perfect, high-energy dance track dedicated to making one person feel amazing.