(noun)
1)The "headbutt heard 'round the world", performed by
Zidane on Materazzi in the final match of the 2006 World
Cup. A combination of
Zidane's name and "hadouken", a technique found in the Street Fighter video game.
(noun)
2)Any powerful headbutt to the chest which results in the victim being knocked down/unconscious
(verb)
3)To perform the above maneuver.
"Dude, the Zidouken is the new Chuck
Norris roundhouse kick."
"They were just horsing around until
Harry flattened John with that Zidouken."
"
Don't make me Zidouken your ass! ZIDOUUUUUUUUUKEN!!!!"