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1.
to yell at someone and make them feel afraid and worthless
"Man, the Sarge came in last night and gave Williams both barrels of the shit shotgun for fucking up"
by ArmyDave September 23, 2006
 
2.
To blow explosive diarrhea at something other than a toilet
The restaurants food sucked so I shit shotgunned the wall in the bathroom.
by PP HEAD January 27, 2009