Meaning
A complete mess / a can of worms
Example
A lista de exigências virou um balaio de gato no fim do projeto.
The list of requirements turned into a complete mess by the end of the project.
Origin
A balaio is a wide basket woven from thick straw or wicker, once common on farms and in homes. The image behind balaio de gato is plain: imagine several cats shut inside one basket — a squirming, snarling tangle.
Source: Aulete.
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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