The water that is left behind after the completion of a beer pong game in which water is used instead of beer as the competitors choose to sip on the beer instead from their cans. Once in a while heavily intoxicated players might forget about this and will go ahead and drink this horrid adiwater.
Hemanth: "Hey I am feeling quite thirsty! I am just going drink some water from this cup right here :)!"
Yash: "Awhh... Dude you sippin on that Adiwater..."
Hemanth: "Why didn't you tell me! NOOOOO"