Someone who threatens suicide with ridiculous ideals and threats that could only leave him with bruises.

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.

Refers to how Harry Potter in the HP book series always gets stuff for no apparent reason and no one understands why.
To achieve something amazing against all odds, and usually undeserved. For instance, if the kid at the bottom of your class wound up valedictorian, he has just pulled a potter.