Obnoxnox
A person who acts like they're the king of the world, but they're actually just a loudmouth with a bad attitude.
My cousin is obnoxnox. He talks over everyone at family dinners like he's the only one who matters.
That kid in my class is obnoxnox. He yells at the teacher every time she says something wrong.
My neighbor is obnoxnox. He plays his music so loud at 2 a. m. I can't sleep.