Angelito is the diminutive form of "ángel" (angel), meaning "little angel." It's an endearing term that suggests innocence and purity.
In the song, the singer uses angelito to describe himself when he's with one particular woman, contrasting it with his more rebellious side when he's with another. This word highlights the duality of his personality and adds a touch of playful irony to the lyrics.
Calibre 50's "Mitad Y Mitad" is a super fun song about a guy who's living a double life, and he's totally okay with it! He admits, "No sé que pasa conmigo / Pero cuando estoy con ella / Me gusta agarrar la fiesta / Y ando al cien" [I don't know what's wrong with me / But when I'm with her / I like to party / And I'm at a hundred percent]. This 'bad girl' brings out his wild side, and he's ready for a night of whiskey and secret spots, letting loose and having a blast.
But then, there's the other side of him! He says, "Pero cuando estoy con la otra / Soy el típico angelito / Puro y fiel" [But when I'm with the other one / I'm the typical little angel / Pure and faithful]. This 'good girl' gets a completely different kind of date: a park, ice cream, and even church! He's not trying to hide it either, stating, "Y mi amor es según con la que ande" [And my love depends on who I'm with]. He's got a heart for both, "Mitad Y Mitad" [Half and Half], embracing both his wild and angelic sides depending on who he's with.