A man who has slept with at least one hundred different women over the course of his life.
Note: Sleeping with hookers, pre-teens, or family members does not count towards the title of "Century Man."
Dave: I just won the Pulitzer Prize for my new novel!
Jim: Yeah? Well I banged your girlfriend last night and now I'm a Century Man.
Dave: Damn... I wish I was as cool as you.