兒子胡說 Your Son Talks Nonsense
行者道：「這獃子又胡說了。」八戒道：「你的兒子胡說。才那兩個擡水的妖精說，安排素筵席與唐僧吃了成親哩。」行者道：「这呆子又胡说了。」八戒道：「你的儿子胡说。才那两个抬水的妖精说，安排素筵席与唐僧吃了成亲哩。」
逐句解 Line by line
Pilgrim said, "The Idiot is talking nonsense again."
The word 又, again, is the whole of Pilgrim's opinion. He does not argue with the content.
Bajie said, "It is your son who talks nonsense."
A stock retort of Ming vernacular abuse, and rougher than it looks in English: claiming somebody's son said it puts the speaker a generation up and is a standard way of insulting a man through his family. Coming from Bajie to Pilgrim, who has no son, it is pure playground.
"Those two water-carrying fiends said just now that they are laying out a plain feast, and when the monk of Tang has eaten it they are to be married."
And at last he delivers the intelligence, in the middle of a squabble. The order of operations is entirely Bajie: divide the luggage, insult his brother, then mention the news.
The scene is built on a reversal. Bajie has been the fool for six passages, and now he turns out to be the only one who knows what is happening. He is right about the facts and wrong about everything else, which is a fair summary of his role in the book.
The insult is a useful window on how Ming characters actually swore at each other. Chinese abuse works through the family line, and to attribute nonsense to a man's son is to assert seniority over him. It is not obscene; it is a status move, and it is the sort of thing brothers say.
Note also what Bajie leaves out of his report. He does not mention the bow, the grandmother, or the three questions he could not answer. He was there, he got the information, and the manner of getting it does not survive into his account.