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A face shaker is when you let out such a loud and gross burp that your whole face looks like it’s about to explode, and you shake your head like you just saw a dead rat.
After eating three burgers and a giant milkshake, my friend let out a face shaker so loud, the whole restaurant turned around.
My mom burped so hard during church, the priest looked like he was about to leave.
I burped so hard during my math test, the teacher asked if I was having a seizure.