Fast Talking, Fast Speaker, Fast Speaking, Quick Talker
Noun and の adjective
はやくち
わたしの兄は、とても早口です。
My older brother is a really fast talker.
お前のことが一ばん大すきだよって、何でそんなに早口で言ったの？
Why did you say that you love me the most so quickly?
こんなに早口の赤ん坊なんて見たことないよ。
I’ve never seen such a fast talking baby before.
When you have a fast mouth, you're probably a fast talker, right motormouth?
Remember how body parts often change even jukugo words to kun'yomi readings? That's what happened here too. Both readings are kun'yomi, making this one はやくち.