Shut the living
fuck up is used when its predecessor "shut the
fuck up" just simply isn't enough.
Used against highly annoying people, that won't stop
even after being asked nicely.
Someone has been annoying for a whole
bunch of people for a while (yelling, complaining, etc..) and none had the
courage to stand up, until someone, that couldn't take anymore, just shouted "will you just shut the LIVING
fuck UP!"
Satisfaction guaranteed.