From the Greek Word "rubbus ducktus" meaning "to glaze over ice" A being of supreme snow riding ability, skis, snowboards, dimensional lumber, the backs of two grizzly bears.... you name it, he can ride it down a mountain.... FAST!!!!
1) A guy that puts on a condom before sex while riding on top of a train that is moving through a low clearing. He must use a "rubber", and he must "duck" in order to stay safe.
"I wish Ezekial wasn't such a pussy. He never takes unnecessary risks, and on our way to Florida he insisted on being a rubber duck. At least he kept his heads safe."