Meaning
To not mince words / To be blunt
Example
Minha avó não tem papas na língua, fala tudo que pensa na cara de qualquer um.
My grandmother doesn't mince words, she says whatever she thinks to anyone's face.
Origin
To speak sem papas na língua is to speak with nothing softening the tongue. Papa (from Latin pappa) is the soft, mushy baby food or pap; a tongue coated in such mush would slur and muffle one's words, so having none means speaking plainly and bluntly.
Source: Priberam.
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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