machine gun mouth
A machine gun mouth is someone who talks so much and so fast it’s like they’re trying to make your ears bleed with all their nonsense.
My neighbor talked about his lawn for 30 minutes straight. I thought I was going to lose my hearing.
My friend started telling me about his sandwich like it was the most important thing in the world. I wanted to scream.
My little brother talked about his video game for 2 hours. I had to leave the room to survive.