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A person who can't shut up and yells about anything from the moment they wake up to the moment they fall asleep.
I woke up to my neighbor screaming about his cereal being too soggy. I didn't even eat cereal today.
My dad yelled at the TV for 3 hours because the football game was on mute.
My friend's mom started arguing with the mailman about the wrong address on her package. The mailman left.