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1.
Used to the same effect as "shut the hell up" by someone who doesn't use the word hell, often little kids who get in trouble for such "cuss words."
Person 1: You're such a momma's boy!
Person 2: Oh yeah? Well, shut the heck up!
Person 1: Ooh, real tough! What's the matter, mommy won't let you say hell?
Person 2: ...SHUT UP!
by Soupy November 03, 2008
 
2.
Heckup is basically used when you are frustrated on someone then you use this word........it is like fuck up..
Shut the heck up can be used in many situation's....
SHUT THE HECK UP!!
what the heck is wrong with you..
what the heck are you mad.?
by kp i'm BITW December 30, 2013