不用发“the”音。在读音时what the连读为/wɔðə/。

what the hell的用法：

1、表示“无所谓”：

I was going to work tonight,but what the hell,let's go to a movie instead.

我本来想着要去加班呢，但管他呢，我们去看电影吧。

2、表示“吃惊；莫名其妙”：

I saw this kid banging his head against the wall and I was like what the hell.

我看到那个小孩用头撞墙，当时我真是一脸莫名其妙。

3、用以加强问句的语气：

Where the hell are you going?