Meaning
Really good, excellent
Example
Esse pão de queijo tá bão demais da conta!
This cheese bread is really good!
Origin
Goiano-Mineiro dialect form. Bão is the regional pronunciation of bom, and demais da conta is a fixed intensifier — literally 'beyond what's accounted for' = 'beyond measure.
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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