noun, meaning a major loser or a screw up. a lemonboy is usually the kid with no friends who sits all alone in his room, studying cars. It can also be used to describe a large mistake.
A drink made from Lemons and Vodka enjoyed by arrogant assholes in and around the area of Menlo Park, CA. Lemoncillo can apparently only be made one way. Made perfectly in Menlo Park.