You use a beer pong table w/ teams of 2. Have a cup filled w/ a full beer on each corner.
The object is to hit the cup on the side for the ball to go somewhere. You and your partner start chugging your beer until the other team has retrieved the ball and put it back on the table to make you stop drinking (if the ball rolls back to you on the table after hitting the cup you may swat it out of the way). If you sink the ball into the cup, you and your partner get to drink for 5 seconds, but the opposing team can count as fast as they want.
If you knock one of the cups over from throwing the ball that cup must be refilled to the top. First team to finish both cups wins. Make sure you have room to move around. Game can get intense and you will rarely get a break from drinking unless you lose.