A reason to shout out this word is..To be in utter Dismay, to see something so insanely intense, You'll shit bricks for a week, Handicapping you to walk like you have a dildo shoved up your ass.
Warning: Saying this wordmay cause you to tap dance uncontrollably, like how Bill Cosby says "God Dammit!", or "Jesus Christ!", even as much as how he slurs his speech, which sounds like he has a dildo shoved down his throat.
*Sally gets Orbital nuked, while being eaten by the Kool-Aid Man*
Little Billy: Holy Jesus Tap Dancing Christ!
*Billy shits bricks, Tap-Dances home with dildo shoved up his ass, and tells parents about what happened to Sally which then causes a 'Brick-Shitting Chain Reaction*
Can be used as a expression of surprise/dismay/happiness/anger. John Belushi says this in the film "The Blues Brothers" when John Belushi realizes he needs to get his band back together.
John Belushi (as "Joliet" Jake Blues): "The band...the band!"
James Brown (as the church pastor): "Do you see the light?"