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2.
Taking a drag from a cigarette/cigar, then expelling the smoke into someone's mouth (usually your girlfriend) while they inhale it. Like an open-mouthed kiss, except with smoke involved.
Dude, look at those 2 shotgunning! She looks like she's enjoying it.
by Jenni N. June 13, 2008
 
1.
(Shotgunning) Shotgunning a beer is the simple act of consuming a beer at a high rate of speed.
Shotgunnin a beer is easy when following these steps:

1) Hold a beer can in a horizontal position with the bottom tilted up just a bit. Poke a hole on the side near the bottom where you would see an air bubble if the can were clear. Poke this hole with a screwdriver, knife or a Shotgun Key.

2) Place your mouth over the hole while lifting it to an upright position.

3) After you have reached an upright position, pull the tab at the top of the can and consume the beer as fast as possible.

Shotgunning a beer is easy when you follow these directions!
by Gunnar Jones November 07, 2007
 
3.
Throwing a handful of pennies at strippers or homeless people.
Dang man, we had such a great time shotgunning those women last night.
by Cageman December 23, 2011
 
4.
1. When a person who's smoking takes a hit of weed and transfers the smoke to another person by using their fists to make a tunnel between their mouths.

2. When a guy or girl takes a hit and transfers the smoke to their partner through a kiss. As one exhales the smoke, the other one should inhale the smoke into their lungs. Very efficient use of weed and extremely sexy.
1. "Yo dude.. we don't have that much weed left so we're shot-gunning that shit, you down ?"

2. "When my boyfriend's shot-gunning me, I literally get weak in the knees."
by brendabong2 December 30, 2009
 
5.
A sexual act that involves a man cumming into another partner's mouth who has a gauged labret piercing. The partner with the piercing then yells "shotgun" and ejects the fluid at the man through the labret.

May also evolve into snowballing.
Shotgunning: Rich orgasms into Jackie's mouth, at which time Jackie jumps up, yells 'shotgun!', and ejects the cum into Rich's face.
by Rich and Jackie September 24, 2007
 
6.
(named after the beer drinking style) a sexual act where a female rides her partner cowgirl style (representing a can getting poked) than right before she gets off she crawls over the mans head and cums in his mouth and he swallows the cum (representing drinking the beverage)
Leslie was riding John in a cowgirl fashion when she was close to her orgasm she crawled up to john's head and had an orgasm in his mouth (this is called Shotgunning)
by Gibsonwizard13 November 19, 2013
 
7.
When you bang a can (usually of beer) against your head until the metal splits, causing the drink to spray a stream out.
"You wanna go shot gunning and try to impress those girls?"

"No, my head already hurts enough."
by Anadarko June 14, 2009