Meaning
Go for it! / Give it your all!
Example
Renan mandou ver ontem na aula de história, respondeu tudo certo!
Renan gave it his all in history class yesterday, answered everything right!
Origin
'Mandar ver' literally = 'order (someone) to see.' The current meaning ('go for it,' 'do it with gusto') is Brazilian slang from the second half of the 20th century, popularised in samba, football commentary and everyday speech as an encouragement to act decisively.
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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