Obnoctoid
Someone so obnoxious they probably had a pet rat that told everyone their secrets.
My friend is an obnoctoid. He interrupts every conversation like he’s the main character of a soap opera.
My teacher is an obnoctoid. She writes on the board so messy it looks like a toddler had a tantrum.
My little brother is an obnoctoid. He screams his name every time he enters a room like he’s a rockstar.