1. A reporter or journalist who is assigned to research or gather information, as at the scene of an event or from various sources. (Variant spelling of "legman.") Leg men from the local news stations were already at the scene of the shooting before the police had even arrived. I learned some valuable skills about networking in my time as a leg man for the newspaper.
2. A person, typically an assistant, employed or assigned to carry out various tasks, such as running errands or delivering messages, especially outside of the office. (Variant spelling of "legman.") I worked as a leg man for a number of years in the giant corporation before finally being promoted to a position with a bit more responsibility.
3. slang A man who is specifically attracted to or interested in the shape of a person's (typically a woman's) legs. Some men are preoccupied with the size of a woman's bust, but I've always been more of a leg man myself.