The Designated decoy, is a person that remains sober but acts drunk, speeds, and swerves making the cops think that they are drunk. During this thoughtless act, which happens after closing, he/she gets the cops to follow him/her or pull them over allowing the real drunks to stumble away safely.
You guys owe me from being the last dd (Designated Decoy). Last time I got pulled over by the cops for an hour while they made me do every sobriety test known to man. At least everyone was able to swerve home safely!