(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.