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1.
A Haiduken is a person, usually a male, who has a hairstyle which resembles a person who has just been blasted by one of ryu or ken's Haiduken move (Street Fighter). The hair usually consists of multiple spikes all with enough gel to cut through glass.
"Why are there so many Haidukens at this party???"
by VPM April 22, 2008
 
2.
to enact a special power move, used in street fighter
when marcos was tired, to finish off bobby; he used his special power move while he yelled HAIDUKEN!!

he had a perfect score as well as a combo,

later on marcos was eventually arrested for
possesion of special power moves
by J Jizzle yo its carl March 13, 2007