Meaning
To move in together / To shack up
Example
Eu acho que deveríamos juntar nossas escovas de dentes!
I think we should move in together!
Origin
This is a modern, playful colloquialism rather than a historical phrase. Juntar as escovas de dentes literally means "to put the toothbrushes together," and it pictures the small but telling moment when a couple's most personal daily objects end up sharing the same bathroom cup.
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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