Shut down is a psuedonym for sucking dick. This psuedonym is used to be more descreet about one's actual intended meaning and to get past profanity filters on social media. Shut refers to the closing action of the mouth, and down is borrowed from the slang "going down", which means to have oral sex.
I really want to shut down right now.
When Missy has had enough and wants to sleep
I need to sleep so shut it down Jay
Shut it down.
Said by a friends father that has an hilarious wisconian accent.
Jash (supposed to be pronounced as Josh), Jash! Shut it down!
You need to shut it down jash!
Jash, shut it down man!
a forced shut down means an immediate action must be taken or a holt in proceeding.
"Sam has committed fraud we will need to do a forced shut down on him" meaning termination
another way of saying "no way" or "yeah right"
girl 1:i just won $500
girl 2:shut your face down
girl1:no really,i did
girl 2:thats awesome