Oveja negra literally translates to "black sheep." It's an idiomatic expression that refers to a person who is considered an outcast or different from the rest of their family or group.
In the song, Brray uses this phrase to describe a shared rebellious spirit with his love interest, singing, "Tú eres como yo, la oveja negra del rebaño" (You are like me, the black sheep of the flock). This makes the word interesting because it highlights a unique connection between them, suggesting they both embrace their individuality and stand out from the crowd.
Brray opens with a fake apology: "Baby perdón, si se me nota la mala intención" (Baby, sorry if my bad intentions show). He is not sorry at all. He has her attention, she undresses him with her eyes ("Tú con los ojo' me quitas el pantalón", you take my pants off with your eyes), and he promises he won't pressure her.
The chorus is pure relief: "Que por fin se nos dio" (it finally happened for us), the two of them "sólitos" (all alone, a cute diminutive of solos). He admits he's been seen with "diferentes amante'" (different lovers), calls them both "la oveja negra del rebaño" (the black sheep of the flock), and boasts about being "calle, pero elegante" (street, but classy). Watch the Puerto Rican habit of dropping the final s: adulto', gusto', amante'. It's a cheeky, flirty party track, and the line about giving her a monthly allowance after having a kid is a lot for a first night.