What the?

Dominic has picked up an unsettling expression from school.  He goes: "What the?" each time a new challenge presents itself while he played a game on the computer. 

T'is a befuddlement. 

What do we do with him and his new expression?  On the one hand, none of the expression's variants lead to anything good.  But on the other hand, he does a full stop after the second word, and there's nothing wrong with the phrase as it is.

So what the...do we do?

* * *