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A magical drink you pour into someone’s mouth when they won’t stop talking and you’re about to lose your mind.
I just said 'a cup of shut the fuck up' to my brother during dinner. He talked for 20 minutes about his pet goldfish.
My mom gave me a cup of shut the fuck up after I blabbed about my day for an hour.
My friend got a cup of shut the fuck up from his teacher after he talked through the entire math test.