a cup of shut the fuck up
A way to tell someone they are not allowed to speak, especially if they are being dumb or too loud.
My teacher said 'a cup of shut the fuck up' to me because I was being too loud.
I said 'a cup of shut the fuck up' to my friend because he was being too dumb.
My brother said 'a cup of shut the fuck up' to me after I talked for too long.