According to Best Web Health, the best way to chug a beer quickly is to open the throat. Opening the throat allows beer to be gulped down within seconds.
Practicing with water first is a good way to condition a throat for chugging. Best Web Health suggests removing the beer from the refrigerator before chugging. A beer that is too cold is hard to swallow, but a beer that is too warm causes bloating. Allowing the carbonation to leave the beer can after opening it also makes the drink more digestible. To chug the beer, let gravity pull the beer down the throat, or fill the mouth with beer and then swallow.