What does Shotgun a beer mean?
Shotgunning a beer means punching a hole in a can and drinking it in a few seconds.
"On three we both shotgun a beer. Whoever's last buys the next round."
You poke a hole near the bottom of the can, put your mouth on it and then pop the tab. The air makes the beer rush out super fast. It is a party ritual, but you get a lot of alcohol in very quickly. Also read about chug, adten and drinking game.
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