to go overboard, to go off the deep end
Na festa de ontem, ele enfiou o pé na jaca e bebeu demais.
At yesterday's party, he went overboard and drank too much.
Despite the modern wording, enfiar o pé na jaca ("to stick one's foot in the jackfruit") was originally enfiar o pé no jacá. A jacá (from Tupi) was a basket of bamboo or vine slung on the flanks of pack animals. Drovers would stop at roadside taverns and, once drunk, miss their footing when remounting and plant a foot right in the jacá.
Source: Qual é a Gíria?.
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