Double Barrel Shit
When you defecate in your pants and the fecal matter sprays out both pant legs.
Dude, I had the worst diarrhea last night, and I totally did a double barrel shit.
Hair triggered double barreled shit machine gun
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.