What the hell

We cannot stop sayings. We should carry on with our work. Not to bother much.

This is just a way to express disgust.

when anything make them too much angry it seems to them a condition of like in hell as the hell is very bad.

what the hell , they mean that what is this unnecessary thing is going on

They use these words when something is going wrong than what they expected.

This is basically an expression or a phrase which is quite often used by people when they are dissatisfied with the proceedings going around them...

Apart from this, I often heard people saying, "It is hot as a hell", "Go to hell" and "Who the hell you are?"...

It has nothing to do with hell but an idiomatic expression to indicate intensity and emphasis!

There is no hell or heaven.Its a human feelings .when he is in happy mood seems to be heaven and when not feels about hell.