1. A man who believes the ladies love him - however he is sorely and ignorantly mistaken. A dickman will live his entire life under the impression that people enjoy his presence - but they do not.
2. Dickman is also a common term for people who "cut you off" on the road. It's origin lies in the original definition of dickman, as many qualities of a dickman carry over to various other parts of a dickman's life.
I can't believe that guy keeps hitting on me, as if he could ever get with me...what a dickman!
An eloquent insult conjured up in the 2010 era to describe or refer to someone in the act of dicking around, dicking with and/or around someone, or flat out being a dick. All of this without visual contact of said dick.
"Keegan you dickman, get over here with that hammer."
"Dickman alert: Here comes Preston."
"Throw away that apple core you dickman."