Meaning
To get hammered / to drink yourself silly
Example
Ele chapou o coco na festa e só foi pra casa de manhã.
He got hammered at the party and only went home in the morning.
Origin
Coco is colloquial Portuguese for the head, and chapar is to flatten or stamp. By the 1990s 'chapar' had become standard Brazilian slang for being intoxicated; chapar o coco is the head-flattening version of the same image.
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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