Presumo comes from the verb presumir, which means "to show off" or "to brag". It's a word that can sometimes have a negative connotation of being boastful.
However, in this song, the singer uses it in the most romantic way possible. Singing "Te presumo" is a passionate declaration of pride, meaning "I show you off" because he is so incredibly proud of his partner and wants the whole world to know how wonderful she is. It's a unique and powerful way to express deep admiration.
This song is a massive, public declaration of love! The title, "Te Presumo," means "I show you off," and that's exactly what the singer does. He believes that "un verdadero amor nunca se esconde" (a true love is never hidden) and feels "un gran orgullo ser tu hombre" (a great pride in being your man). He's not just happy to be in a relationship; he wants everyone to know how amazing his partner is.
He piles on the compliments, calling her his "gran tesoro" (great treasure) and "toda una reina" (a total queen). He even says she looks like a "muñequita" (little doll). The feeling is so strong that just holding her hand makes him feel powerful, "como ningún otro humano" (like no other human). He's completely smitten and wants the whole world to know she belongs to him.