erwin
a beer or alcoholic drink that has been left out unfinished. usually found in large numbers the next morning after a party.
Example:
1st guy: "dude, grab me a beer while you're up."
2nd guy: "no way, you already have two erwins sitting in front of you."
1st guy: "dude, grab me a beer while you're up."
2nd guy: "no way, you already have two erwins sitting in front of you."