1.To say or be used ,when forgotten something totally Fuckin stupid or you known that something:funny,or hilarous has happened.or is about to happen.
2.Basically alot of times blondes use it when they for get that extra tampon.
3.Or when your a total fuckin douche and swallow your gum.

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.