这个是很有意思的话题

1. 可以先百度，听听这首歌《What Part of No》

Sir if you don't mind I'd rather be alone

From the moment I walked in tonight

You've been coming on

If I've told you once I've told you twice

I'm just here to unwind

I'm not interested in romance or

What you have in mind

What part of no don't you understand

To put it plain and simple

I'm not into one night stands

I'll be glad to explain it

If it's too hard to comprehend

So tell me what part of no

Don't you understand

I appreciate the drink and the

Rose was nice of you

I don't mean to be so mean

But I don't think I'm getting through

No I don't need no company

No I don't want to dance

So what part of no don't you understand

What part of no don't you understand

To put it plain and simple

I'm not into one night stands

I'll be glad to explain it

If it's too hard to comprehend

So tell me what part of no

Don't you understand

简注： 

be into = 喜欢；one night stand 一夜情

2. 

'What part of no don't you understand' 

这个表达出现的时间非常晚，估计也就是90年代的事情

它的意思就像字面上一样清楚，然后就是它可以有变体，

即

 'what part of  [插入] don't you understand?'.

题主的就是这种结构

What part of [you are exposed] do you not understand