Wiktionary
what the heck
phr. (context euphemistic English) A "softer" way to say '''what the hell.
Usage examples of "what the heck".
But to a German who has never seen the genuine article, and who's looking through a periscope--what the heck?
Several appeared pregnant, but we didn't see any male equivalents another one of those mysteries, like what the heck they did here, where were they going, and so on.
It seems you're never able to fight at long range, but what the heck.
I dashed it off this morning, what the heck, all we gotta do is see can you remember your lines.