Saudade is a uniquely Portuguese word for a deep, bittersweet longing for someone or something absent, often carrying the quiet fear that it may never return. English has no single word for it, which is why Portuguese speakers often just borrow it untranslated.
In this song the word carries real intensity: "Ando louco de saudade" ("I'm going crazy with longing") shows how overwhelming saudade can feel, almost like a kind of madness born from missing someone you love.
Maria Rita sings from inside an ache she can't shake. She opens with a string of losses: "Nunca mais ouvi falar de amor" (Never again did I hear love spoken of), "Nunca mais um beija-flor" (never again a hummingbird) — small, specific things gone from her life, standing in for the one person she's actually grieving.
The chorus names the feeling outright: "Ando louco de saudade" (I'm going mad with longing), "Saudade que é louca por você" (a longing that's crazy for you). She wants the pain to end — "Levando a dor pra ter um fim" (carrying the pain toward an end) — but the song keeps circling back to the same refusal: "Não, nunca mais" (No, never again). She'd rather stay wrecked by this one love than let it fade into just another old phrase.