Everyone brings a high amount of legal and/or illegal drugs (most likely in form of pills) and throw them unlabled in a bowl with candys.
Then the bowl is handed from player to player untill just one person remains.
The last one standing or at least alive is obviously the winner.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi