My favourite Uruguayan slang phrase is a variant of “raining cats and dogs” that goes llueven pingüinos de punta. It means “it’s raining penguins headfirst”

Loving the variations, portuguese is "chovendo canivetes", means "raining pocket knives"

A Venezuelan expression for someone not that bright is la inteligencia los persigue, ellos son más rápidoso. It means “intelligence is chasing them, but they are faster”