Shotgunning a beer is a technique for rapidly consuming a can or bottle of beer. It involves puncturing a hole in the bottom of the container and then covering the opening with your thumb while you drink from the top. This creates a vacuum that allows the beer to flow out of the bottom hole and into your mouth.
Shotgunning a beer is a popular party trick and can be a fun way to drink beer quickly. However, it is important to note that shotgunning beer can be dangerous if you are not careful. If you shotgun a beer too quickly, you can end up inhaling beer into your lungs, which can lead to choking or even death.