(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.

It’s an acronym standing for Can’t Remember A Fucking Thing. It’s usually used to describe embarrassment at being unable to remember someone (CRAFT moment); going onstage as the lead in the latest theatrical performance and your mind goes completely blank (CRAFT situation); the next morning after a night when you got pissed as a fart and woke up in bed cuddling a traffic cone and a string of fairy lights wound round your prick.