Meaning
To shoot the breeze / to have a chat
Example
Bora trocar ideia tomando um café depois do trabalho?
Wanna shoot the breeze over a coffee after work?
Origin
Trocar ideia is built from transparent parts: trocar ("to exchange, swap") and ideia ("idea, thought"). To "swap ideas" with someone is simply to talk things over, sharing thoughts back and forth — much like the English "to exchange ideas," only used in a relaxed, everyday register.
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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