Bunda is a colloquial and somewhat playful term for "butt" or "backside," often used in a dance context.
While not a formal Italian word, it's borrowed from Brazilian Portuguese slang and is increasingly common in Italian pop music, especially in songs with a Latin or reggaeton influence. In this song, "Muove il bunda su e giù" (Moves the bunda up and down) clearly refers to dancing, making it an interesting and culturally relevant word for learners to encounter.
Pucho spends the whole song insisting he is fine, and the hook gives him away in the same breath: "Io non mi innamorerò, però mi sta piacendo" (I'm not going to fall in love, but I'm enjoying this). Then he lays out the terms of the arrangement, "Vuole un Lambo, glielo prendo / Faccio i soldi e lei li spende" (She wants a Lambo, I'll get it for her / I make the money and she spends it), which sounds like a boast right up until Cristy and Mia answer with the same two lines rewritten in their own favour: "Voglio un Lambo, me lo prendo / Lui fa i soldi, io li spendo" (I want a Lambo, I'll get it myself / He makes the money, I spend it). Nobody is winning this argument. They just keep restating it over a Brazilian funk chant, "Passinho do Jamal" (Jamal's little dance step), with the verdict tucked in between: "Não serve pra namorar" (he is not someone to date).
The one verse that drops the act is short. "Io non mi innamorerò o forse sì" (I'm not going to fall in love, or maybe I will) is the closest either side comes to admitting anything, and it gets buried under a shopping trip two lines later: "Prima spendiamo da Chanel, tanto la carta è la mia" (First we spend at Chanel, the card is mine anyway). By the outro all that survives is the flex, repeated four times over, "Sto con la mia baddie in festa" (I'm out partying with my baddie), which is what people say when they would rather not finish the sentence they started.