know what

基本解释

If this is a red, I want to know - what's orange?
如果这是红的，我想知道- 橘色是什么？
So don’t put it anywhere except your you-know-what!
所以，除非你真知道，可别随便用哦。
We're not gonna lie, one of the best fill-in-the-blanks here is, "I love your you-know-what" (or whatever word you can say without laughing or blushing too much.)
不是让你去撒谎，最适合填空的话就是：“我喜欢你的某某地方”（或者任何讲起来自己不会发笑和脸红，比较靠谱的赞美话）。

It is also important to know what to do if the signs appear -- in yourself or in someone else.
I know not what the younger dreams-- Some vague Utopia--and she seems, When withered old and skeleton-gaunt, An image of such politics.
我不知年幼者梦想什么-,某种模糊的乌托邦--她仿佛，当枯萎衰老瘦骨嶙峋的时候，这类政治的一个鬼影。
耶鲁公开课 - 现代诗歌课程节选
Does anyone know the history of what Fibonacci was trying to do? Sorry, let me re-ask that. Fibonacci.
创始人是斐波纳契,有人知道斐波纳契想要干什么吗？抱歉，让我再问一次。
麻省理工公开课 - 计算机科学及编程导论课程节选

Briefly, talks have stalemated, along with discussions on you-know-what-else, for an FAA re-authorization bill.
FORBES: Airlines Raise Fees As FAA Taxes Go Uncollected