A deeply sexual act involving a beer bottle and a funnel. It is the act of inserting the neck of the beer bottle into the vagina and emptying it inside of it. You then release the beer out of the vagina and drink it through the funnel.
guy: "hey, babe, you up for some intense beerwanging tonight? ;D "
girl: "wtf? is that even possible??"
guy: "it's worth a shot!"