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Same as dickhead, used in Grand Theft Auto IV by Mohammed, one of Roman's idiotic taxi drivers.
Deliberately used to show bad English knowledge.
Get in quickly, you head-dick.
by Fennek June 25, 2009
To "headdick" someone means to surprisingly put your penis on a friends forehead and slap him several times in order to punish him for making a mistake/ doing something the wrong way.
while Steve was sleeping, Brian headdicked him like a bauss!
Bring me that money you owe me or I will headdick you hard
by I_love_papaschlumpf June 09, 2010