One who clearly loves a damn good session, and sending their head around the bend by consuming vast amounts of alcohol and/or various other substances (usually the latter)

Can usually be found talking codshit, raving, or dying in a hole.

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.

it comes from the french word for no job and fucked up
a mess head could do any drugs or just sniff packet meals?
someone who is so fucked they lick old newspaper cuttings for nutrition and one time they took so much pills they went back in time

A sick clothing line. Also can be used to refer to the wearer of said messhead clothing. Can also be used as an adjective to describe a person, though the connotation is neither good nor bad and entirely up for interpretation.

a man who does not shower for days, despite getting his dick sucked by a 250 lb hog. Therefore, his hair is messy due to a lack of showering and his smaller, more sensitive dome is tarnished with the remains of a man-juice-milkshake improperly guzzled by a fat troll.