鹽醬口 The Salt And Sauce Mouth
正講處，只聽得呼呼風響。慌得那八九個老者戰戰兢兢道：「這和尚鹽醬口，說妖精，妖精就來了。」那老李開了腰門，把幾個親戚連唐僧，都叫：「進來，進來，妖怪來了。」諕得那八戒也要進去，沙僧也要進去。正讲处，只听得呼呼风响。慌得那八九个老者战战兢兢道：「这和尚盐酱口，说妖精，妖精就来了。」那老李开了腰门，把几个亲戚连唐僧，都叫：「进来，进来，妖怪来了。」諕得那八戒也要进去，沙僧也要进去。
逐句解 Line by line
Just as they were talking, there came the sound of wind, hu-hu.
得 in 聽得 is the full verb dé. 處 is chù, marking the point at which something happens.
It threw the eight or nine elders into such a fluster that they said, all atremble, "This monk has a salt-and-sauce mouth. He speaks of the demon and the demon comes."
鹽醬口 — a "salt-and-sauce mouth" — is a mouth that seasons what comes after it: one that brings about whatever it names. English would say somebody had jinxed it. Note that 得 here is the light de after 慌, where the very same character was the full verb one segment earlier.
Old Li opened the side gate and called his few relatives, and the Tang Monk with them: "In, come in! The monster is here!"
腰門 is a door set into the middle of a wall rather than at its end. The old man is called Old Li for the first time here, fifteen hundred characters and twenty-two passages after he gave his surname.
It frightened Eight Rules so that he wanted to go in as well, and Sha Monk wanted to go in too.
諕 is xià, to frighten — pinned corpus-wide, because automatic transcription supplies an unrelated reading every time it appears.
The wind arrives mid-sentence, which is this chapter's habit with anything important. The farmstead appeared while an argument was running; the demon comes while a negotiation is closing.
鹽醬口 is the elders' entire theory of what has just happened. Naming a thing fetches it, so the fault is Pilgrim's for talking about it. They are frightened, and by their own lights they are also being perfectly logical.
The last two clauses are built to match — Eight Rules wanted in, Sha Monk wanted in — with the same four characters repeated. The two disciples get no separate reaction at all, which is the joke.