When it is very difficult to get into a club, the "doors are tough" or "serious" meaning either that you will not be let in without an ID or that you have to be incredibly hott or look like a model (or terribly rich if you're a guy)

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.