Balanza literally translates to "scale" or "balance". It's an interesting word because it's not just about weight, but about equilibrium and fairness.
In the song, Arcángel uses it metaphorically to describe a relationship that is completely out of balance. He sings, "Entre ustedes ya no existe una balanza" (Between you two, a balance no longer exists), highlighting the unfairness and disequilibrium in the couple's dynamic. This makes it a memorable word for understanding relationship dynamics in Spanish.
Arcángel's "La Pared" is a bold and direct reggaeton track where he's trying to win over a woman who's stuck in a bad relationship. He sees her current partner as a "cabrón" [asshole] and is ready to tear down any emotional walls she's built up. He's basically saying, "Let me jump over that wall they slowly built so no one could get to your heart." He's confident he can make her happy, unlike her current situation where she's always crying and her partner is always drinking.
He's not shy about his intentions, suggesting they skip the arguments and instead "make a puddle in the bed." Arcángel promises to make her feel good, even hinting at a wilder night with lines like "Ma' I know you're bi-, that it looks good when you chi-" and inviting her friend to "make a tri-." It's a playful, provocative song about breaking free from a toxic relationship and embracing a new, passionate connection.