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Called immediately after someone calls "shotgun". Rather than getting the front passenger seat right away, you get it on the way home instead.
"Alright guys, let's get in the car."

"Shotgun!"

"Oh man... Uuhhh... 'Shitgun!'"

"Ok you get the front seat on the way there and you get it on the way back."
Shitgun by Chase Cheffe May 26, 2009
A maneuver popular amongst native Asian youths. It is executed by clasping both hands together with both index fingers extended, sneaking up on an unsuspecting victim, and attempting to sodomize said person with the index fingers.
A little kid tried to shitgun me today and broke both of his index fingers.
Shitgun by mikook April 17, 2008
This is when you do a line of cocaine on a woman's (or guy's) asshole just as they fart.
"Wipe your ass and come over here honey. Today's been a tough day. I need to do a shitgun to forget about it."
Shitgun by Fghgsfjbcft July 11, 2017
While having butt sex, the Penis is pulled out right before ejaculation and is caked with poo. When the jizz finally happens, it comes out with so much force that it shoots a piece of dookie that was lodged in the peehole all the way across the room.
“Bro, I hit the center of the Target with my shitgun last night.”

“I shot my cat in the face with my shitgun on accident right after afternoon tea.”
Shitgun by DinkyPinkSock March 26, 2020

shitgun snip 

What a player does in Battlefield: Bad Company 2 when they select a shotgun, preferably the Neostead 2000 combat, and select the 12 Gauge Slugs specialization and runs around rooftops or in buildings safe from harm and is able to snipe other players from a distance as if he had a "shotgun sniper".
Player1: SHIT! How the hell is that medic able to kill me from the top of the building when I was behind cover and across the street! Thats bullshit!

Player2: The shotgun is ridculous! You can shitgun snip!
shitgun snip by Onslauqht August 10, 2010

Pump-action Shitgun 

The act of stroking ones penis in one quick motion and firing explosive diarrhoea all over your partners body.
Person 1: Hey, I heard you and Lilly got into a fight, What did you do?

Person 2: We were going at it last night and I hit her with a pump-action shitgun. It got pretty nasty.
Pump-action Shitgun by 4nthrax October 23, 2014