nagsock
A nagsock is someone who won't let you finish your thoughts and keeps interrupting like they're on a mission from God.
My sister is a nagsock. She interrupts my game to tell me about her day.
My boss is a nagsock. He walks by my desk every 10 minutes to check on me.
My neighbor is a nagsock. He yells at the kids next door every time they play too loud.