To use when you are having a brain freeze and can't seem to remember someone's name while telling a story about them.

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.

What you would call a random persons name who you can either A-not remember, or B-don't care about.

a random persons nane/what you would call a person if you cannot remember his/her name.