A phrase used do to the pre notion of someone saying something stupid, obnoxious, rude, or negative.
Matt walks in the door with a disgruntled look on his face. Liz is getting the kids ready for bed. The dishes aren't done.
Matt: thinking to himself "why aren't the dishes done?"
Liz:" shut your thoughts up!"
A great way to greet your boss or other superiors
Boss: Hey Mike!
Mike: Shut up retard!
Nvm go away idiot don’t search this up look up “69”
Please “”””nevermind can you shut up pickle
When shut up isn't enough to shut someone up.
You got games on your phone?
Shut your up, Kevin