A drinking game played between men in which the object of the game is to take out your testicles, and have the opponent look at them. Doing so will mean the opponent owes u either a beer to chug, or a shot of hard liquor. Once sack wars are declared, then sacking (the act of pulling out one's sack) is fair game at any time for the rest of your life, until a player surrenders due to emotional trauma for seeing so much ballsack. The drinks owed will tally, and the sacker (the one who sacks you) can make the sackee (the one who sees sack) drink them at any time. WARNING: some will take this game way too far when introduced, even sacking females, and may cause you to surrender so beware. Last but not least, there is a special type of sacking called the goat, in which the sacker tucks his balls between his ass cheeks, and bends over so you see it from behind. This rare maneuver is worth two drinks.