to indicate that someone is not being gracious with their personal resources, cariocas make a fist, which generally follows with the phrase 'pão duro' or mão de vaca', which can be translated to 'hard bread' and 'cow's hand' - hard bread comes from the fact that someone would rather eat stale bread rather than buy a freshly baked batch - cow's hand comes from the fact that cow's cannnot open their hands, thus not being able to give anything. 

always on the hunt for a good deal, cariocas have a strong tendency to visually indicate when something is expensive, rubbing their thumb against the other fingers whilst looking thoroughly unimpressed.

theatric as they are, cariocas like to make their 'no's' have a visual impact, and will often shake their index finger ostentatiously at the person they are refusing - they also have a sign to show that they simply are not phased - slapping back and forward, with their hands horizontally, and the finger tips of their hands.