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2.
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
 
1.
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