heck

interj. darn!, shoot! (mild oath expressing irritation, annoyance, etc.); hell, why not

A minced oath, also known as a pseudo-profanity, is an expression based on a profanity which has been altered to reduce or remove the disagreeable or objectionable characteristics of the original expression; for example, "gosh" used instead of "God," "darn" instead of "damn","heck" instead of "hell" and "freaking" instead of "fucking". Nearly all profanities have minced variants; the words that are most taboo give rise to the most.
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Noun
1. a euphemism for `hell'; "Oh what the heck"
(hypernym) euphemism

n. stern, back part of a boat, rear, back end

v. cut the hedge

(n.)
The bolt or latch of a door.
  

(n.)
An apparatus for separating the threads of warps into sets, as they are wound upon the reel from the bobbins, in a warping machine.
  

(n.)
A rack for cattle to feed at.
  

(n.)
A latticework contrivance for catching fish.
  

(n.)
A door, especially one partly of latticework; -- called also heck door.
  

(n.)
A bend or winding of a stream.