(n.) Used to describe someone who is an illiterate douche. Coupled with a case of arrogance, ignorance, and lacking confidence. People possessing the title of dickhead can easily be found at forums, message boards, and more specifically, at Reddit and Urban Dictionary. People often developed personalities that displeases others, which the witnesses often called that person a dickhead. Used figuratively most often.
"The user who wrote this definition is such a dickhead!"