One who can:
1.) Drink a 12 pack in one sitting, and in under an hour.
2.) Can shotgun 4 12 ounce beers in a row
3.) Can beer bong a 40 ounce
4.) Can shotgun 2 16 ounce tall boys in under 15 seconds.
5.) Can chug an entire pitcher

One is considered skilled in the art of chuggery if he can hit 3 of these 5.