見過鬼就怕黑

[Literization] After seeing a ghost, and becomes afraid of darkness
[Meaning] Once bitten, twice shy

Example
I missed the class for playing TV game and punished by teacher, and will not do it again. Once bitten, twise shy.
上次走堂去打機比老師罰, 下次唔再走堂了. 見過鬼就怕黑.

唔o拏耕

[Meaning] Have no relation

Example 1
I have no relationship with him, so I will not lend him the money.
我同佢都唔o拏耕嘅, 咁我又點會借錢比佢呢.

Example 2
You answer is no related to my question.
你都唔o拏耕嘅; 我問你東, 你就答西.

In some case, 唔o拏耕 is similar with 牛頭唔搭馬咀.
http://goto-cantonese.blogspot.com/2010/09/blog-post.html

o拏(音: 啦)

惦過碌蔗

[Literization] Straighter than a sugar-cane
[Meaning] Feel confidence to do something

Example
I have read the book throughfully, and I feel confidence to pass the exam this time.
我溫晒書去考試, 今次重唔惦過碌蔗.