Meaning
To crack up laughing
Example
A gente ficou rachando o bico com as histórias que ele contou.
We were cracking up at the stories he told.
Origin
Literally "to split the beak". The bico (beak/mouth) splits open from laughing so hard. Brazilian Portuguese popular speech, comparable to English "crack up" or "split one's sides".
Practice idioms with the Idiom Trainer
Falando's Idiom Trainer teaches you to recognize idiom meanings and create sentences using them, so you can speak like a Brazilian.
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