Callejero literally translates to "of the street". While it can be used to describe a stray animal, in this song, it's used to define a personal identity.
Santa Fe Klan sings, "Soy un callejero desde que estaba morrito" (I've been a street person since I was a little kid). He uses the word to express that his character is fundamentally shaped by the streets he grew up on. It implies being street-smart, tough, and fiercely loyal to his neighborhood culture—capturing the song's core theme of being authentic and "real".
Santa Fe Klan's song "Real" is all about authenticity, starting with his loyalty to his crew. He makes it clear he's still with the same people from the very beginning, saying, "Voy con los mismos desde cero" (I'm with the same people from the start). This loyalty extends to his neighborhood, which he calls "la ciudad del delito" (the city of crime). He's not just telling stories; he insists, "Esto es real, no es mito" (This is real, not a myth), and he sees himself as a "callejero" (street kid) who grew up living amongst danger.
But the song's idea of what's "real" gets very personal. He compares his authenticity to the pain of a breakup, stating bluntly, "Real como el dolor que siento desde que no estás" (Real like the pain I feel since you're gone). While he's dealing with that heartbreak, his biggest motivation is his family. The chorus is a promise to them: "No volveremos a tener frío ni hambre" (We will never be cold or hungry again) and "No quiero que trabaje más mi padre" (I don't want my father to work anymore). It's a powerful mix of street pride, personal pain, and deep family love.