Cabeludo literally means "hairy" but in this context, it refers to someone with long hair. It's an interesting and somewhat informal word that evokes a specific image.
In the song, the singer warns their ex that if "um outro cabeludo aparecer na sua rua" (another long-haired guy appears on your street) and makes them miss the singer, it's their own fault. This playful and slightly jealous use of the word makes it memorable and adds a touch of personality to the lyrics.
Raquel Tavares built “Detalhes” around a single dare: try to forget me, see how far you get. The opening line sets the terms outright — “Não adianta nem tentar me esquecer” (“There's no point even trying to forget me”) — and the rest of the song spends its runtime proving it, one leftover habit at a time.
What makes the song work is how small the proof stays. Not grand memories, just “O ronco barulhento do seu carro” (“The noisy rumble of your car”) and “A velha calça desbotada ou coisa assim” (“The old faded pants or something like that”) — the kind of detail nobody notices until it's the only thing left. She even grants that time wears love down “Em quase nada” (“Into almost nothing”), then catches herself: “Mas 'quase' também é mais um detalhe” (“But ‘almost’ is also another detail”) — one more thing he won't quite lose.