Trocando de língua literally means "changing languages". However, in Brazilian Portuguese slang, it's a common and playful euphemism for "French kissing" or "making out".
In the song, the singer is lamenting his ex-partner moving on quickly, and the phrase implies she's already intimately involved with someone new. This double meaning makes it a very interesting and culturally specific phrase to learn.
Ever felt that sting of seeing an ex move on while you're still hurting? Paula Mattos's "Trocando de Língua" captures this feeling perfectly. The song tells a story from the perspective of someone watching their former partner have a great night out, while they are stuck at home dealing with the "bad part" of the breakup. The narrator is filled with despair, scrolling through social media only to see a post from their ex, confirming their fears.
The chorus paints a vivid picture of this contrast. While the ex is out partying and "trocando de língua" (literally "changing tongues," a slang term for kissing someone new), the narrator is just trying to get by. They confess, "Eu não tô vivendo, eu tô me virando" ("I'm not living, I'm just getting by") and are trying to numb the pain by trading water for a glass of pinga, a strong Brazilian spirit. It's a powerful song about heartbreak in the digital age.