Meaning
Lazing around / kicking back / floating along
Example
Passei o domingo de bubuia, sem sair de casa.
I spent Sunday just lazing around at home.
Origin
Bubuia comes from the Tupi mbe'bui (or mbe'mbuya) — a light, floating thing drifting on the water. Amazonian Portuguese kept the word, and de bubuia = 'just floating along, doing nothing.
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More idioms
Acertar na moscaTo guess correctly / To hit the nail on the headAmigo da onçaA fake/false friendAndar na linhaTo toe the line / To behave properlyArmar um barracoTo cause a public sceneRodar a baianaTo cause a public scene / To go ballisticArrumar sarna pra se coçarTo ask for troubleArrastar as asasTo hit on someone / To flirtAbrir o jogoTo come clean / To open upArregaçar as mangasTo roll up one's sleeves / To get to workAgarrar com unhas e dentesTo hold on for dear life / To seize an opportunity