Correct

后脑勺长眼

/ hòu nǎo sháo cháng yǎn /
Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/后脑勺长眼-Chinese-idioms-Cchatty-347c47e1-e363-40a5-93ac-61a12bd23be1-1612776696.jpg

Collocation

1
后脑勺没长眼
2
后脑勺长眼的人
3
莫非是后脑勺长眼了
4
难道后脑勺长眼了
5
后脑勺长只眼

Definition

后脑勺长眼

Literally means:

there's an eye at the back of one's head

Actually means:

后脑勺, the back part of the head, look like a scoop. In a figurative sense, it means that person is very alert and acute.

后脑勺,脑袋的后半部分,从后面看像勺子的形状。形容人很机警,感觉敏锐。

Example

Used as predicate, aitributive and can be used with other words in between. (作谓语、定语,中间可以插入别的词)
1
Pèngshàng
碰上
fēicháng
非常
shìjiàn
事件
  
shìfēi
是非
zhī
  
,
hái
de
hòunǎosháo
后脑勺
shàng
cháng
zhī
yǎn
  
,
fáng
提防
cháng
yǎn
de
qiāngdàn
枪弹
  

Encounter a very event, right and wrong place, you also have to have a long eye on the back of your head, to beware of that not long-eyed bullet.

2
bēizhāo
背着
āmán
阿蛮
gōngzhǔ
公主
biān
一边
zhǎo
shí
食物
biān
一边
zhǎo
  
,
可惜
hòunǎosháo
后脑勺
méi
cháng
yǎn
  
,
fǒu
否则
jiù
huì
xiàn
发现
bēishàng
背上
de
女子
zhēng
chū
露出
liǎn
de
zéi
xiào
  
,
zhēng
zhǔnbèi
准备
zhǎo
huì
机会
duì
xiàshǒu
下毒手
  

He was looking for food while looking for food, but he did not have long eyes in the back of his head, otherwise he will find that the woman on his back is showing a face of thieves smile, is looking for a chance to poison him.

3
Shàng
上课
shí
yào
不要
zuòxiǎodòngzuò
做小动作
  
,
dāngxīn
当心
ge
那个
hòunǎosháo
后脑勺
cháng
yǎn
de
lǎoshī
老师
  

Don't do small movements in class, watch out for the female teacher with long eyes at the back of her head.