heck2 [singular, uncountable] spoken informal
used like 'hell' to emphasize what you are saying:
It cost a heck of a lot of money.
where/how/who etc the heck
Where the heck are we?
He sure as heck didn't tell me.
used to say that you will do something even though you really should not do it:
It's rather expensive, but what the heck.
for fun, or for no particular reason