Ajuician comes from the verb ajuiciar, which means to judge or to become judicious and sensible. It's an interesting word because it implies a shift in behavior, often from being reckless to more responsible.
In the context of the song, the line "Seguro se ajuician dos, tres care locos" suggests that even some of the 'crazy' or wild characters in the neighborhood will eventually settle down and become more sensible. It offers a glimpse into the social dynamics and expectations within the barrio.
Nanpa Básico spends this song naming the block he comes from and refusing to leave it. The hook is a flat statement of address rather than a boast — "Barrio latino eso soy, soy, soy, soy" (Latin neighborhood, that's what I am) — and every time it comes round it is answered by "De mi tierra no me voy" (I'm not leaving my land). The verses fill in what that place looks like: "La gente está bien en el barrio con poco" (people in the neighborhood are doing fine on very little), a couple of friends who get serious enough to start rapping and suddenly become visible to everyone else, and a room with a microphone where "Escribir y hacer beats esa es la vida de nosotros" (writing and making beats, that's our life).
The one anecdote in the song is a small joke about a uniform changing hands. "Le cambié a mi panita el policía las botas por jordan" (I swapped my buddy the cop his boots for Jordans), and after that "Ahora está parchado todo el día y no brega con normas" (now he's hanging out all day and doesn't bother with rules). It is the same point the chorus makes, told sideways: the neighborhood absorbs people rather than the other way round. For a Spanish learner the track is a good ear for Colombian street speech — the clipped past participles "Criao'" for criado and "Peleamo'" for peleamos, and "panita" for a close friend.