naggworm
a person who will talk your ear off about the same stupid thing until you just wanna scream.
Mom: I told you to clean your room. I told you. I told you. I told you.
Bro: You didn't take out the trash. You didn't do your dishes. You didn't even feed the dog.
Teacher: You didn't study for the test. You didn't do your homework. You didn't even show up.