A Shit Machine Gun is an explosion of shit from your ass when you bend over. It needs to have enough force to actually shoot, or fly, and not just fall, from your ass. The consistency is moderate; somewhat watery, somewhat chunky. Mild diarrhea is good for producing a powerful shit machine gun.
"Dude, I fired a wicked powerful shit machine gun the other day. It put a hole in the wall!"
"Yesterday I gave Sarah a shit machine gun and now she's in the hospital with a broken rib."
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This term is used by jim lahey, the trailer park supervisor on trailer park boys. It is one of his many shit analogies used through out the show.
"You idiots have loaded up a hair triggered double barreled shit machine gun and it's pointed at your own heads". The rights to the quote is property of trailer park boys.
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