the hell可表示“到底,究竟”，主要用在what,where,when,who,how之后，相当于on earth，表示一种强烈的语气。
究竟，到底的意思，加重语气，还有点骂人的意思 例如what the hell are you doing? 意思是：你TM到底在干什么？
2020年4月1日 · “What the hell are you doing!?” it is used to express surprise or confusion. it can also be used instead of “what” to make it …
said when you suddenly realize that your plan is not important to you and that you will do something else: I was supposed to be working …
You can say ' what the hell ' when you decide to do something in spite of the doubts that you have about it. [informal, feelings]
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