くち らない
kuchiga heranai

Pre-noun Modifier
Expression

1. fast-talking; always having another argument ready; not able to keep one's mouth shut; never at a loss for words

Related to 口の減らない
ああ えば、こう う。まったく、口 くち らない やつだ。
āieba kō iu. mattaku kuchiga heranai yakko. da
Whatever I say, he has a comeback ready. You can't get a word in edgewise.
Other forms: