in latin culture, a lazy man. a huevon is a person who is so lazy that his testicles drag on the ground. derived from the use of the spanish word huevos (eggs) as a slang word for testicles. A huevona is a the female equivalent, although a bit less true-to-form given the lack of a droopy ballsack!
After a long night of video games, Mateo slept until noon and missed work living up to his title of chief huevon.