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.
by Djinne September 20, 2015