gabby-mouth
A 'gabby-mouth' is someone who yells, talks nonsense, and won’t stop talking even when you throw a shoe at them.
My brother is a gabby-mouth. He talks about video games until I get a headache.
My best friend is a gabby-mouth. She talks about her dog all day long.
My dad is a gabby-mouth. He yells about the news even when no one asks.