Meaning
To ace something / To do with ease
Example
Conhecendo bem o talento dela, sei que está tirando de letra a prova de japonês.
Knowing her talent well, I know she is acing the Japanese test.
Origin
'Tirar de letra' (pull off with a letter) comes from Brazilian samba and capoeira. A 'letra' in samba is a verse; to improvise a perfect verse on the spot is 'tirar de letra.
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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