嘴臉似猢猻 A Face Like A Monkey
行者把金箍棒揝在右手，將左手指定道：「賢甥，叫我怎的？」那妖王見了，心中大怒道：「你這廝：行者把金箍棒揝在右手，将左手指定道：「贤甥，叫我怎的？」那妖王见了，心中大怒道：「你这厮：
逐句解 Line by line
Pilgrim gripped the gold-banded cudgel in his right hand, pointed with his left and said, "Worthy nephew, what do you want with me?"
賢甥 is worthy nephew — sister's son, the exact counterpart of the 外公 he claimed at the gate. Having made himself the grandfather, he promotes the monster to grandson's generation and addresses him politely. 揝 is zǎn, to grip; 康熙 手部九畫 gives one band, 子感切, 音昝, 手動也.
The fiend king saw him and said in a fury, "You creature:
The tag rides at the end of its own sentence and opens the taunt from inside it. 中 is zhōng, inside — the anger is in the middle of him.
"Your looks are like a monkey's, your face like an ape's.
相 is xiàng, appearance. 似 is sì, like. 猢猻 is the ordinary word for a macaque and it is what people call Wukong throughout the novel — the insult is that it is simply true.
"Seven parts of you are genuinely a ghost, and you have the nerve to bully people."
七分 is seven parts in ten, a vernacular way of saying mostly. 分 is fēn, a fraction.
賢甥 is the whole joke in two characters. 外公 is your mother's father; 甥 is your sister's son. Wukong has claimed the senior position and now assigns the fiend the matching junior one, and he does it with 賢 in front of it — worthy nephew — which is exactly how a courteous uncle would address a young relative.
The taunt that comes back is four lines of five characters, and it scans cleanly: 猻 and 人 rhyme at the second and fourth lines, 子 and 鬼 sit outside. It is a competent little poem and it is also, as insults go, feeble. He calls Wukong a monkey.
That is the problem with insulting this particular enemy. 猴子 and 猢猻 are simply what he is, and the chapter uses 猴子 again later without any insult intended. The fiend has spent his best shot on a description.