Terrón literally translates to "lump" or "cube," and it's most often heard in the phrase "terrón de azúcar" (sugar cube).
In this song, ROSALÍA uses this word in a powerful metaphor for vulnerability. By singing "Sólo soy un terrón de azúcar" (I'm just a sugar cube), she portrays herself as sweet but fragile, easily dissolved by the "heat" of a situation or relationship.
This song is a wild ride through a really intense, maybe even dangerous, kind of love. It starts in German with a feeling of total fusion with someone else: "Seine Angst ist meine Angst" (His fear is my fear), "Seine Wut ist meine Wut" (His anger is my anger). The speaker feels everything the other person feels, to the point where their blood is shared. It's a heavy connection, described with the strange image of a flame entering the brain "Wie ein Blei-Teddybär" (Like a lead teddy bear).
Then, ROSALÍA switches to Spanish and offers a completely different view of herself. She says, "Sólo soy un terrón de azúcar" (I'm just a sugar cube), something sweet that dissolves in coffee. She knows how to disappear when things get hot. But the song doesn't stay soft. It builds to a desperate English chant, repeating "I'll fuck you till you love me" over and over. It's a blunt and forceful demand for love, suggesting a relationship that needs "divine intervention" to be saved.