when you have to pee really bad but you have a boner, so you have to do that weird squat/lean forward thing.

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.

An erection caused by the pressure of a full bladder as opposed to sexual excitement.

when yer cock wakes up an hour before you do, because it has to piss.

When a man has an intense need to pee, but cannot do so, and and erection occurs. Usually a painful experience, can also be done intentionally to prevent make it easier to "hold it in".