Caminhonete translates to "pickup truck". It's a very specific and culturally relevant word in Brazil, especially in the context of country music and rural life.
In the song, the singer is pleading with his love interest to "Desce dessa caminhonete" (Get out of that pickup truck). This phrase is central to the song's narrative, as it represents her potentially leaving him for someone else or a different lifestyle, making the word both interesting and pivotal to the story.
This song is a super fun story about a guy who messed up big time with his girlfriend. They had a fight, and she told him she was going to forget him by going out to parties with loud music, or "nos automotivo" [in the automotive sound scene]. He knows she's usually a "santinha" [little saint] and doesn't usually go to these kinds of "revoadinha" [parties], so he decides to go check it out for himself.
He can't believe his eyes when he sees her at an "eletro funk" party! His heart starts beating faster than the speakers, and he's desperate to get her back. He begs her, "Perdoa eu bebê, esquece os boy de juliete, desce, desce dessa caminhonete" [Forgive me, baby, forget those guys in Juliets, get down, get down from that pickup truck]. He even promises to bring the "paredão" [big sound system] to her "kit net" [small apartment] if she'll just come back to him. It's a hilarious and relatable plea for forgiveness!