what the heck

a popular phrase used from max from the Children’s TV show the Amazing World of Max.

WHAT THE HECK ARE YOU DOING?

What the heck

It can be used to say that you will do something although you know you should not do it.
It expresses confusion and is a short way of saying what the hell.

Guy 1: What the heck? A rock appeared from nowhere!
Guy 2: Crazy, right?
Guy 1: I know!

What the heck

Used immediately when your network broke
Used when you had a fucking bad day

Network broke

Man: what the heck?!

Example 2

Keybord stopped

Man: WHAT THE HECK!