you-know-what
pronoun /ˌjuː nəʊ ˈwɒt/
  /ˌjuː nəʊ ˈwʌt/
(informal)- used when you want to talk about something without mentioning its name, although the person you are speaking to knows what it is你知道什么:当你想谈论某事而又不提及其名字时使用,尽管与你交谈的人知道它是什么 - Our neighbour was finally arrested for you-know-what.我们的邻居最终因不知所云被逮捕了。 
 
- Our neighbour was finally arrested for you-know-what.