Checkpoint is an interesting word choice because it's an English word directly incorporated into Portuguese slang, especially in the context of Brazilian favelas.
In the song, "Checkpoint na favela" refers to a literal or metaphorical stopping point or control point within the favela. It sets a scene of a specific, perhaps illicit, gathering or event, making it intriguing for a learner to understand its usage in this cultural context.
Have you ever had a fight with someone and just needed to escape? That's the whole mood of this Brazilian funk hit! The singer tells us he's just had a fight with his partner ('tô brigado com a mulher') and instead of staying home, he's planning a big party. He declares, 'hoje é fuga', meaning 'today is an escape'.
His escape plan is simple: head to a 'checkpoint na favela', a meeting spot in the neighborhood, and call 'todas elas' (all the girls) to join. He's determined to have a good time, repeating that he's going to drink and smoke ('vou beber ou fumar'). But this isn't just about one night of fun. He makes it very clear that he's made a decision, singing over and over, 'mas eu não volto para você'—'but I'm not coming back to you'.