滿口胡柴 Your Mouth Is Full Of Rubbish
那國丈聞言，付之一笑。用手指定唐僧道：「呵呵呵，你這和尚滿口胡柴。寂滅門中，須云認性。你不知那性從何而滅，枯坐參禪，盡是些盲修瞎煉。那国丈闻言，付之一笑。用手指定唐僧道：「呵呵呵，你这和尚满口胡柴。寂灭门中，须云认性。你不知那性从何而灭，枯坐参禅，尽是些盲修瞎炼。
逐句解 Line by line
The Royal Father-in-Law heard him out and put it aside with a laugh.
付之一笑 — to hand a thing over to a laugh — is a set phrase for dismissing something as beneath argument, and it is still current. Here 一 is an ordinary modifier before a fourth tone and shifts in the usual way; it is not one of the chapter's counted digits.
Pointing his finger at the Tang Monk he said, "Ha, ha, ha! You monk, your mouth is full of rubbish.
胡柴 hú chái — literally reckless firewood — is a Ming slang word for talking nonsense, built on the same reckless 胡 that gave 胡說 at the city gate. Pointing at somebody is rude in any Chinese century.
"In the gate of stillness and extinction you must talk of recognising the nature.
He opens by conceding the ground: yes, your school says the work is done on the nature. He is setting up to say that they cannot do it.
"You do not know where that nature is extinguished to. Sitting withered in meditation, it is all blind practice and sightless refining.
盲修瞎煉 — blind cultivating and sightless smelting — is a real term of abuse between the two traditions, and the metallurgy in it is pointed: 煉 is what you do to cinnabar in a furnace. He is saying they are doing his craft badly.
The reply opens with a laugh, a pointed finger and a slang word, which after sixteen lines of high parallel prose is a deliberate change of register. He is refusing the form of the argument before he answers its content.
His actual objection is sharper than his manners. Buddhist practice claims to work on the nature; he says its practitioners have no idea what becomes of the nature when it is extinguished, and are therefore sitting in the dark. It is a real criticism and a very old one.