Meaning
True-blue Goiano / Goiano through and through
Example
Sou goiano do pé rachado, nasci e cresci aqui.
I'm a true-blue Goiano, born and raised here.
Origin
The image is of feet cracked from a lifetime walking the dry, hot land of rural Goiás barefoot or in cheap sandals. To be do pé rachado is to be a real-deal Goiano with rural roots — the term is now worn proudly even by city-dwellers.
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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