Shotgunning is a means of consuming a beverage, particularly beer, very quickly by punching a hole in the side of the can, near the bottom, placing the mouth over the hole, and pulling the tab to open the top. The beer quickly drains, and is quickly consumed.
A related technique, strawpedoing or snorkeling, is used for containers not easily punctured such as a glass bottle. A straw is inserted into the bottle to similar effect.
The technique increases beverage delivery since the extra hole allows the liquid to leave while air enters simultaneously through the main hole. The bottleneck, created where air entering the container must travel through the same orifice as liquid leaving, is removed.
To shotgun a beverage, a small hole is punched in the side of the can, close to the bottom. In order to prevent the liquid from spilling out while the cut is made, the can is held horizontally, tilted slightly, and the hole is made in the resulting air pocket. The hole can be made with any sharp object. Typically a key, bottle opener, pen, knife, other sharp instrument is used. The drinker then places their mouth over the hole while rotating the can straight up. When the can's tab is pulled, the liquid will quickly drain through the hole into the drinker's mouth.
Those with significant experience sometimes create the opening using a thumb - a technique referred to as "renegading" and popularized by Tony Drewry, front man of the Texas band, Shotgun Friday.