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1.
To viciously head-butt a person. Taken from the nickname of footballer Zinadine Zidane.
Oh! Did you see him Zizou that guy? His head must be made of steel!
by Doom209999 July 12, 2006
 
2.
Head hutting someone in the chest
During the fight he got Zizou'd the hell out
by Doolio August 14, 2006