Correct

嘴巴油

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Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/嘴巴油-Chinese-idioms-Cchatty-764e53ca-0b9c-40f4-ab2b-4616430a29c4-1612776763.jpg

Collocation

1
嘴巴油的人
2
嘴巴太油
3
嘴巴一点也不油
4
嘴巴油了点儿
5
某人嘴巴油

Definition

嘴巴油:

Literally means:

there is grease in the mouth

Actually means:

It means that one has a smooth tongue and often speaks frivolously. Derogatory.

形容说话轻浮油滑,不正经。含贬义。

Example

Used as predicate or attributive. It can be used with other words in between. (作谓语、定语,中间可插入其他词语)
1
kàn
rénjiā
人家
xiǎoliú
小刘
  
,
zuǐba
嘴巴
diǎn
yóu
  
,
shuō
de
shǎo
zuò
de
duō
  
xiàng
  
,
guāng
shuō
zuò
  
,
jiù
zhīdào
知道
shuǎzuǐ
耍嘴皮子
  

You see people Xiao Liu, mouth is not oily at all, say less and do more. Unlike you, just say no and you'll know to play with your mouth.

2
de
zhè
wèi
péngyou
朋友
chúle
除了
zuǐba
嘴巴
yóu
diǎn
zhīwài
之外
  
,
其他
fāngmiàn
方面
hái
cuò
不错
  

My friend is fine in everything but a little oil in his mouth.

3
rènwéi
认为
zuǐba
嘴巴
yóu
de
nánrén
男人
shízài
实在
  
,
yǒudiǎnr  
有点儿
kàobuzhù
靠不住
  

She thinks the man with the oil in his mouth is not real and a little unreliable.